1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
|
drop table if exists t1, t2, t3;
CREATE TABLE t1 (
event_date date NULL,
type int DEFAULT '0' NOT NULL,
event_id int DEFAULT '0' NOT NULL,
PRIMARY KEY (event_date,type,event_id)
);
INSERT INTO t1 VALUES ('1999-07-10',100100,24), ('1999-07-11',100100,25),
('1999-07-13',100600,0), ('1999-07-13',100600,4), ('1999-07-13',100600,26),
('1999-07-14',100600,10), ('1999-07-15',100600,16), ('1999-07-15',100800,45),
('1999-07-15',101000,47), ('1999-07-16',100800,46), ('1999-07-20',100600,5),
('1999-07-20',100600,27), ('1999-07-21',100600,11), ('1999-07-22',100600,17),
('1999-07-23',100100,39), ('1999-07-24',100100,39), ('1999-07-24',100500,40),
('1999-07-25',100100,39), ('1999-07-27',100600,1), ('1999-07-27',100600,6),
('1999-07-27',100600,28), ('1999-07-28',100600,12), ('1999-07-29',100500,41),
('1999-07-29',100600,18), ('1999-07-30',100500,41), ('1999-07-31',100500,41),
('1999-08-01',100700,34), ('1999-08-03',100600,7), ('1999-08-03',100600,29),
('1999-08-04',100600,13), ('1999-08-05',100500,42), ('1999-08-05',100600,19),
('1999-08-06',100500,42), ('1999-08-07',100500,42), ('1999-08-08',100500,42),
('1999-08-10',100600,2), ('1999-08-10',100600,9), ('1999-08-10',100600,30),
('1999-08-11',100600,14), ('1999-08-12',100600,20), ('1999-08-17',100500,8),
('1999-08-17',100600,31), ('1999-08-18',100600,15), ('1999-08-19',100600,22),
('1999-08-24',100600,3), ('1999-08-24',100600,32), ('1999-08-27',100500,43),
('1999-08-31',100600,33), ('1999-09-17',100100,37), ('1999-09-18',100100,37),
('1999-09-19',100100,37), ('2000-12-18',100700,38);
select event_date,type,event_id from t1 WHERE event_date >= "1999-07-01" AND event_date < "1999-07-15" AND (type=100600 OR type=100100) ORDER BY event_date;
event_date type event_id
1999-07-10 100100 24
1999-07-11 100100 25
1999-07-13 100600 0
1999-07-13 100600 4
1999-07-13 100600 26
1999-07-14 100600 10
explain select event_date,type,event_id from t1 WHERE type = 100601 and event_date >= "1999-07-01" AND event_date < "1999-07-15" AND (type=100600 OR type=100100) ORDER BY event_date;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
select event_date,type,event_id from t1 WHERE event_date >= "1999-07-01" AND event_date <= "1999-07-15" AND (type=100600 OR type=100100) or event_date >= "1999-07-01" AND event_date <= "1999-07-15" AND type=100099;
event_date type event_id
1999-07-10 100100 24
1999-07-11 100100 25
1999-07-13 100600 0
1999-07-13 100600 4
1999-07-13 100600 26
1999-07-14 100600 10
1999-07-15 100600 16
drop table t1;
CREATE TABLE t1 (
PAPER_ID int DEFAULT '0' NOT NULL,
YEAR int DEFAULT '0' NOT NULL,
ISSUE int DEFAULT '0' NOT NULL,
CLOSED int DEFAULT '0' NOT NULL,
ISS_DATE date,
PRIMARY KEY (PAPER_ID,YEAR,ISSUE)
);
INSERT INTO t1 VALUES (3,1999,34,0,'1999-07-12'), (1,1999,111,0,'1999-03-23'),
(1,1999,222,0,'1999-03-23'), (3,1999,33,0,'1999-07-12'),
(3,1999,32,0,'1999-07-12'), (3,1999,31,0,'1999-07-12'),
(3,1999,30,0,'1999-07-12'), (3,1999,29,0,'1999-07-12'),
(3,1999,28,0,'1999-07-12'), (1,1999,40,1,'1999-05-01'),
(1,1999,41,1,'1999-05-01'), (1,1999,42,1,'1999-05-01'),
(1,1999,46,1,'1999-05-01'), (1,1999,47,1,'1999-05-01'),
(1,1999,48,1,'1999-05-01'), (1,1999,49,1,'1999-05-01'),
(1,1999,50,0,'1999-05-01'), (1,1999,51,0,'1999-05-01'),
(1,1999,200,0,'1999-06-28'), (1,1999,52,0,'1999-06-28'),
(1,1999,53,0,'1999-06-28'), (1,1999,54,0,'1999-06-28'),
(1,1999,55,0,'1999-06-28'), (1,1999,56,0,'1999-07-01'),
(1,1999,57,0,'1999-07-01'), (1,1999,58,0,'1999-07-01'),
(1,1999,59,0,'1999-07-01'), (1,1999,60,0,'1999-07-01'),
(3,1999,35,0,'1999-07-12');
select YEAR,ISSUE from t1 where PAPER_ID=3 and (YEAR>1999 or (YEAR=1999 and ISSUE>28)) order by YEAR,ISSUE;
YEAR ISSUE
1999 29
1999 30
1999 31
1999 32
1999 33
1999 34
1999 35
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
drop table t1;
CREATE TABLE t1 (
id int NOT NULL auto_increment,
parent_id int DEFAULT '0' NOT NULL,
level int DEFAULT '0' NOT NULL,
PRIMARY KEY (id),
KEY parent_id (parent_id),
KEY level (level)
);
INSERT INTO t1 VALUES (1,0,0), (3,1,1), (4,1,1), (8,2,2), (9,2,2), (17,3,2),
(22,4,2), (24,4,2), (28,5,2), (29,5,2), (30,5,2), (31,6,2), (32,6,2), (33,6,2),
(203,7,2), (202,7,2), (20,3,2), (157,0,0), (193,5,2), (40,7,2), (2,1,1),
(15,2,2), (6,1,1), (34,6,2), (35,6,2), (16,3,2), (7,1,1), (36,7,2), (18,3,2),
(26,5,2), (27,5,2), (183,4,2), (38,7,2), (25,5,2), (37,7,2), (21,4,2),
(19,3,2), (5,1,1), (179,5,2);
SELECT * FROM t1 WHERE level = 1 AND parent_id = 1;
id parent_id level
2 1 1
3 1 1
4 1 1
5 1 1
6 1 1
7 1 1
SELECT * FROM t1 WHERE level = 1 AND parent_id = 1 order by id;
id parent_id level
2 1 1
3 1 1
4 1 1
5 1 1
6 1 1
7 1 1
drop table t1;
create table t1(
Satellite varchar(25) not null,
SensorMode varchar(25) not null,
FullImageCornersUpperLeftLongitude double not null,
FullImageCornersUpperRightLongitude double not null,
FullImageCornersUpperRightLatitude double not null,
FullImageCornersLowerRightLatitude double not null,
index two (Satellite, SensorMode, FullImageCornersUpperLeftLongitude, FullImageCornersUpperRightLongitude, FullImageCornersUpperRightLatitude, FullImageCornersLowerRightLatitude));
insert into t1 values("OV-3","PAN1",91,-92,40,50);
insert into t1 values("OV-4","PAN1",91,-92,40,50);
select * from t1 where t1.Satellite = "OV-3" and t1.SensorMode = "PAN1" and t1.FullImageCornersUpperLeftLongitude > -90.000000 and t1.FullImageCornersUpperRightLongitude < -82.000000;
Satellite SensorMode FullImageCornersUpperLeftLongitude FullImageCornersUpperRightLongitude FullImageCornersUpperRightLatitude FullImageCornersLowerRightLatitude
OV-3 PAN1 91 -92 40 50
drop table t1;
create table t1 ( aString char(100) not null default "", key aString (aString(10)) );
insert t1 (aString) values ( "believe in myself" ), ( "believe" ), ("baaa" ), ( "believe in love");
select * from t1 where aString < "believe in myself" order by aString;
aString
baaa
believe
believe in love
select * from t1 where aString > "believe in love" order by aString;
aString
believe in myself
alter table t1 drop key aString;
select * from t1 where aString < "believe in myself" order by aString;
aString
baaa
believe
believe in love
select * from t1 where aString > "believe in love" order by aString;
aString
believe in myself
drop table t1;
CREATE TEMPORARY TABLE t1 (
t1ID int NOT NULL auto_increment,
art varbinary(1) NOT NULL default '',
KNR char(5) NOT NULL default '',
RECHNR char(6) NOT NULL default '',
POSNR char(2) NOT NULL default '',
ARTNR char(10) NOT NULL default '',
TEX char(70) NOT NULL default '',
PRIMARY KEY (t1ID),
KEY IdxArt (art),
KEY IdxKnr (KNR),
KEY IdxArtnr (ARTNR)
) ENGINE=MyISAM;
INSERT INTO t1 (art) VALUES ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),
('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j');
select count(*) from t1 where upper(art) = 'J';
count(*)
213
select count(*) from t1 where art = 'J' or art = 'j';
count(*)
602
select count(*) from t1 where art = 'j' or art = 'J';
count(*)
602
select count(*) from t1 where art = 'j';
count(*)
389
select count(*) from t1 where art = 'J';
count(*)
213
drop table t1;
create table t1 (x int, y int, index(x), index(y));
insert into t1 (x) values (1),(2),(3),(4),(5),(6),(7),(8),(9);
update t1 set y=x;
explain select * from t1, t1 t2 where t1.y = 8 and t2.x between 7 and t1.y+0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref y y 5 const 1 Using where
1 SIMPLE t2 range x x 5 NULL 2 Using where; Using join buffer
explain select * from t1, t1 t2 where t1.y = 8 and t2.x >= 7 and t2.x <= t1.y+0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref y y 5 const 1 Using where
1 SIMPLE t2 range x x 5 NULL 2 Using where; Using join buffer
explain select * from t1, t1 t2 where t1.y = 2 and t2.x between t1.y-1 and t1.y+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref y y 5 const 1 Using where
1 SIMPLE t2 range x x 5 NULL 3 Using where; Using join buffer
explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= t1.y-1 and t2.x <= t1.y+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref y y 5 const 1 Using where
1 SIMPLE t2 range x x 5 NULL 3 Using where; Using join buffer
explain select * from t1, t1 t2 where t1.y = 2 and t2.x between 0 and t1.y;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref y y 5 const 1 Using where
1 SIMPLE t2 range x x 5 NULL 2 Using where; Using join buffer
explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= 0 and t2.x <= t1.y;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref y y 5 const 1 Using where
1 SIMPLE t2 range x x 5 NULL 2 Using where; Using join buffer
explain select count(*) from t1 where x in (1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref x x 5 const 1 Using where; Using index
explain select count(*) from t1 where x in (1,2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index x x 5 NULL 9 Using where; Using index
drop table t1;
CREATE TABLE t1 (key1 int NOT NULL default '0', KEY i1 (key1));
INSERT INTO t1 VALUES (0),(0),(0),(0),(0),(1),(1);
CREATE TABLE t2 (keya int NOT NULL default '0', KEY j1 (keya));
INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref j1 j1 4 const 1 Using index
1 SIMPLE t1 index i1 i1 4 NULL 7 Using where; Using index; Using join buffer
explain select * from t1 force index(i1), t2 force index(j1) where
(t1.key1 <t2.keya + 1) and t2.keya=3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref j1 j1 4 const 1 Using index
1 SIMPLE t1 index i1 i1 4 NULL 7 Using where; Using index; Using join buffer
DROP TABLE t1,t2;
CREATE TEMPORARY TABLE t1 (
a int default NULL,
b int default NULL,
KEY a (a),
KEY b (b)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES
(1,1),(2,1),(3,1),(4,1),(5,1),(6,1),(7,1),(8,1),(9,1),(10,2),(10,2),
(13,2),(14,2),(15,2),(16,2),(17,3),(17,3),(16,3),(17,3),(19,3),(20,3),
(21,4),(22,5),(23,5),(24,5),(25,5),(26,5),(30,5),(31,5),(32,5),(33,5),
(33,5),(33,5),(33,5),(33,5),(34,5),(35,5);
EXPLAIN SELECT * FROM t1 WHERE a IN(1,2) AND b=5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 2 Using where
SELECT * FROM t1 WHERE a IN(1,2) AND b=5;
a b
DROP TABLE t1;
CREATE TABLE t1 (a int, b int, c int, INDEX (c,a,b));
INSERT INTO t1 VALUES (1,0,0),(1,0,0),(1,0,0);
INSERT INTO t1 VALUES (0,1,0),(0,1,0),(0,1,0);
SELECT COUNT(*) FROM t1 WHERE (c=0 and a=1) or (c=0 and b=1);
COUNT(*)
6
SELECT COUNT(*) FROM t1 WHERE (c=0 and b=1) or (c=0 and a=1);
COUNT(*)
6
DROP TABLE t1;
CREATE TABLE t1 ( a int not null, b int not null, INDEX ab(a,b) );
INSERT INTO t1 VALUES (47,1), (70,1), (15,1), (15, 4);
SELECT * FROM t1
WHERE
(
( b =1 AND a BETWEEN 14 AND 21 ) OR
( b =2 AND a BETWEEN 16 AND 18 ) OR
( b =3 AND a BETWEEN 15 AND 19 ) OR
(a BETWEEN 19 AND 47)
);
a b
15 1
47 1
DROP TABLE t1;
CREATE TEMPORARY TABLE t1 (
id int NOT NULL AUTO_INCREMENT ,
line int NOT NULL default '0',
columnid int NOT NULL default '0',
owner int NOT NULL default '0',
ordinal int NOT NULL default '0',
showid int NOT NULL default '1',
tableid int NOT NULL default '1',
content int NOT NULL default '188',
PRIMARY KEY ( owner, id ) ,
KEY menu( owner, showid, columnid ) ,
KEY `COLUMN` ( owner, columnid, line ) ,
KEY `LINES` ( owner, tableid, content, id ) ,
KEY recount( owner, line )
) ENGINE = MYISAM;
INSERT into t1 (owner,id,columnid,line) values (11,15,15,1),(11,13,13,5);
SELECT id, columnid, tableid, content, showid, line, ordinal FROM t1 WHERE owner=11 AND ((columnid IN ( 15, 13, 14 ) AND line IN ( 1, 2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 31 )) OR (columnid IN ( 13, 14 ) AND line IN ( 15 ))) LIMIT 0 , 30;
id columnid tableid content showid line ordinal
13 13 1 188 1 5 0
15 15 1 188 1 1 0
drop table t1;
create table t1 (id int primary key);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
select id from t1 where id in (2,5,9) ;
id
2
5
9
select id from t1 where id=2 or id=5 or id=9 ;
id
2
5
9
drop table t1;
create table t1 ( id1 int not null, id2 int not null, idnull int null, c char(20), primary key (id1,id2));
insert into t1 values (0,1,NULL,"aaa"), (1,1,NULL,"aaa"), (2,1,NULL,"aaa"),
(3,1,NULL,"aaa"), (4,1,NULL,"aaa"), (5,1,NULL,"aaa"),
(6,1,NULL,"aaa"), (7,1,NULL,"aaa"), (8,1,NULL,"aaa"),
(9,1,NULL,"aaa"), (10,1,NULL,"aaa"), (11,1,NULL,"aaa"),
(12,1,NULL,"aaa"), (13,1,NULL,"aaa"), (14,1,NULL,"aaa"),
(15,1,NULL,"aaa"), (16,1,NULL,"aaa"), (17,1,NULL,"aaa"),
(18,1,NULL,"aaa"), (19,1,NULL,"aaa"), (20,1,NULL,"aaa");
select a.id1, b.idnull from t1 as a, t1 as b where a.id2=1 and a.id1=1 and b.id1=a.idnull order by b.id2 desc limit 1;
id1 idnull
drop table t1;
create table t1 (
id int not null auto_increment,
name char(1) not null,
uid int not null,
primary key (id),
index uid_index (uid));
create table t2 (
id int not null auto_increment,
name char(1) not null,
uid int not null,
primary key (id),
index uid_index (uid));
insert into t1(id, uid, name) values(1, 0, ' ');
insert into t1(uid, name) values(0, ' ');
insert into t2(uid, name) select uid, name from t1;
insert into t1(uid, name) select uid, name from t2;
insert into t2(uid, name) select uid, name from t1;
insert into t1(uid, name) select uid, name from t2;
insert into t2(uid, name) select uid, name from t1;
insert into t1(uid, name) select uid, name from t2;
insert into t2(uid, name) select uid, name from t1;
insert into t1(uid, name) select uid, name from t2;
insert into t2(uid, name) select uid, name from t1;
insert into t1(uid, name) select uid, name from t2;
insert into t2(uid, name) select uid, name from t1;
insert into t2(uid, name) select uid, name from t1;
insert into t2(uid, name) select uid, name from t1;
insert into t2(uid, name) select uid, name from t1;
insert into t1(uid, name) select uid, name from t2;
delete from t2;
insert into t2(uid, name) values
(1, CHAR(64+1)),
(2, CHAR(64+2)),
(3, CHAR(64+3)),
(4, CHAR(64+4)),
(5, CHAR(64+5)),
(6, CHAR(64+6)),
(7, CHAR(64+7)),
(8, CHAR(64+8)),
(9, CHAR(64+9)),
(10, CHAR(64+10)),
(11, CHAR(64+11)),
(12, CHAR(64+12)),
(13, CHAR(64+13)),
(14, CHAR(64+14)),
(15, CHAR(64+15)),
(16, CHAR(64+16)),
(17, CHAR(64+17)),
(18, CHAR(64+18)),
(19, CHAR(64+19)),
(20, CHAR(64+20)),
(21, CHAR(64+21)),
(22, CHAR(64+22)),
(23, CHAR(64+23)),
(24, CHAR(64+24)),
(25, CHAR(64+25)),
(26, CHAR(64+26));
insert into t1(uid, name) select uid, name from t2 order by uid;
delete from t2;
insert into t2(id, uid, name) select id, uid, name from t1;
select count(*) from t1;
count(*)
1026
select count(*) from t2;
count(*)
1026
analyze table t1,t2;
Table Op Msg_type Msg_text
test.t1 analyze status OK
test.t2 analyze status OK
explain select * from t1, t2 where t1.uid=t2.uid AND t1.uid > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # range uid_index uid_index 4 # # Using where
1 SIMPLE # ref uid_index uid_index 4 # #
explain select * from t1, t2 where t1.uid=t2.uid AND t2.uid > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # range uid_index uid_index 4 # # Using where
1 SIMPLE # ref uid_index uid_index 4 # #
explain select * from t1, t2 where t1.uid=t2.uid AND t1.uid != 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # range uid_index uid_index 4 # # Using where
1 SIMPLE # ref uid_index uid_index 4 # #
explain select * from t1, t2 where t1.uid=t2.uid AND t2.uid != 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # range uid_index uid_index 4 # # Using where
1 SIMPLE # ref uid_index uid_index 4 # #
select * from t1, t2 where t1.uid=t2.uid AND t1.uid > 0;
id name uid id name uid
1001 A 1 1001 A 1
1002 B 2 1002 B 2
1003 C 3 1003 C 3
1004 D 4 1004 D 4
1005 E 5 1005 E 5
1006 F 6 1006 F 6
1007 G 7 1007 G 7
1008 H 8 1008 H 8
1009 I 9 1009 I 9
1010 J 10 1010 J 10
1011 K 11 1011 K 11
1012 L 12 1012 L 12
1013 M 13 1013 M 13
1014 N 14 1014 N 14
1015 O 15 1015 O 15
1016 P 16 1016 P 16
1017 Q 17 1017 Q 17
1018 R 18 1018 R 18
1019 S 19 1019 S 19
1020 T 20 1020 T 20
1021 U 21 1021 U 21
1022 V 22 1022 V 22
1023 W 23 1023 W 23
1024 X 24 1024 X 24
1025 Y 25 1025 Y 25
1026 Z 26 1026 Z 26
select * from t1, t2 where t1.uid=t2.uid AND t1.uid != 0;
id name uid id name uid
1001 A 1 1001 A 1
1002 B 2 1002 B 2
1003 C 3 1003 C 3
1004 D 4 1004 D 4
1005 E 5 1005 E 5
1006 F 6 1006 F 6
1007 G 7 1007 G 7
1008 H 8 1008 H 8
1009 I 9 1009 I 9
1010 J 10 1010 J 10
1011 K 11 1011 K 11
1012 L 12 1012 L 12
1013 M 13 1013 M 13
1014 N 14 1014 N 14
1015 O 15 1015 O 15
1016 P 16 1016 P 16
1017 Q 17 1017 Q 17
1018 R 18 1018 R 18
1019 S 19 1019 S 19
1020 T 20 1020 T 20
1021 U 21 1021 U 21
1022 V 22 1022 V 22
1023 W 23 1023 W 23
1024 X 24 1024 X 24
1025 Y 25 1025 Y 25
1026 Z 26 1026 Z 26
drop table t1,t2;
create table t1 (x bigint unsigned not null);
insert into t1(x) values (0x0ffffffffffffff0);
insert into t1(x) values (0x0ffffffffffffff1);
select * from t1;
x
1152921504606846960
1152921504606846961
select count(*) from t1 where x>0;
count(*)
2
select count(*) from t1 where x=0;
count(*)
0
select count(*) from t1 where x<0;
count(*)
0
select count(*) from t1 where x < -16;
count(*)
1
select count(*) from t1 where x = -16;
count(*)
1
select count(*) from t1 where x > -16;
count(*)
0
select count(*) from t1 where x = 18446744073709551601;
count(*)
0
create table t2 (x bigint not null);
insert into t2(x) values (-16);
insert into t2(x) values (-15);
select * from t2;
x
-16
-15
select count(*) from t2 where x>0;
count(*)
0
select count(*) from t2 where x=0;
count(*)
0
select count(*) from t2 where x<0;
count(*)
2
select count(*) from t2 where x < -16;
count(*)
0
select count(*) from t2 where x = -16;
count(*)
1
select count(*) from t2 where x > -16;
count(*)
1
select count(*) from t2 where x = 18446744073709551601;
count(*)
0
drop table t1,t2;
create table t1 (x bigint not null primary key) engine=innodb;
insert into t1(x) values (0x0ffffffffffffff0);
insert into t1(x) values (0x0ffffffffffffff1);
select * from t1;
x
1152921504606846960
1152921504606846961
select count(*) from t1 where x>0;
count(*)
2
select count(*) from t1 where x=0;
count(*)
0
select count(*) from t1 where x<0;
count(*)
0
select count(*) from t1 where x < -16;
count(*)
0
select count(*) from t1 where x = -16;
count(*)
0
select count(*) from t1 where x > -16;
count(*)
2
select count(*) from t1 where x = 18446744073709551601;
count(*)
0
drop table t1;
create table t1 (a bigint unsigned);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` BIGINT UNSIGNED DEFAULT NULL
) ENGINE=InnoDB COLLATE = utf8_general_ci
create index t1i on t1(a);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` BIGINT UNSIGNED DEFAULT NULL,
KEY `t1i` (`a`)
) ENGINE=InnoDB COLLATE = utf8_general_ci
insert into t1 values (9223372036854775807);
truncate t1;
insert into t1 select 18446744073709551615;
insert into t1 select 18446744073709551614;
explain select * from t1 where a <> -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index
select * from t1 where a <> -1;
a
-1
explain select * from t1 where a > -1 or a < -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index
select * from t1 where a > -1 or a < -1;
a
-2
explain select * from t1 where a > -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index
select * from t1 where a > -1;
a
explain select * from t1 where a < -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index
select * from t1 where a < -1;
a
-2
drop table t1;
create table t1 (a char(10), b text, key (a));
INSERT INTO t1 (a) VALUES
('111'),('222'),('222'),('222'),('222'),('444'),('aaa'),('AAA'),('bbb');
explain select * from t1 where a='aaa';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 43 const 2 Using where
explain select * from t1 where a=binary 'aaa';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 43 NULL 2 Using where
explain select * from t1 where a='aaa' collate utf8_bin;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 43 NULL 2 Using where
drop table t1;
CREATE TABLE t1 (
`CLIENT` char(3) collate utf8_bin NOT NULL default '000',
`ARG1` char(3) collate utf8_bin NOT NULL default '',
`ARG2` char(3) collate utf8_bin NOT NULL default '',
`FUNCTION` varchar(10) collate utf8_bin NOT NULL default '',
`FUNCTINT` int NOT NULL default '0',
KEY `VERI_CLNT~2` (`ARG1`)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES ('000',' 0',' 0','Text 001',0), ('000',' 0',' 1','Text 002',0),
('000',' 1',' 2','Text 003',0), ('000',' 2',' 3','Text 004',0),
('001',' 3',' 0','Text 017',0);
SELECT count(*) FROM t1 WHERE CLIENT='000' AND (ARG1 != ' 1' OR ARG1 != ' 2');
count(*)
4
SELECT count(*) FROM t1 WHERE CLIENT='000' AND (ARG1 != ' 2' OR ARG1 != ' 1');
count(*)
4
drop table t1;
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t2 (
pk1 int NOT NULL,
pk2 int NOT NULL,
pk3 int NOT NULL,
pk4 int NOT NULL,
filler char(82),
PRIMARY KEY (pk1,pk2,pk3,pk4)
);
insert into t2 select 1, A.a+10*B.a, 432, 44, 'fillerZ' from t1 A CROSS JOIN t1 B;
INSERT INTO t2 VALUES (2621, 2635, 0, 0,'filler'), (2621, 2635, 1, 0,'filler'),
(2621, 2635, 10, 0,'filler'), (2621, 2635, 11, 0,'filler'),
(2621, 2635, 14, 0,'filler'), (2621, 2635, 1000015, 0,'filler');
SELECT * FROM t2
WHERE ((((pk4 =0) AND (pk1 =2621) AND (pk2 =2635)))
OR ((pk4 =1) AND (((pk1 IN ( 7, 2, 1 ))) OR (pk1 =522)) AND ((pk2 IN ( 0, 2635))))
) AND (pk3 >=1000000);
pk1 pk2 pk3 pk4 filler
2621 2635 1000015 0 filler
drop table t1, t2;
create table t1(a char(2), key(a(1)));
insert into t1 values ('x'), ('xx');
explain select a from t1 where a > 'x';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 7 NULL 2 Using where
select a from t1 where a > 'x';
a
xx
drop table t1;
CREATE TABLE t1 (
OXID varchar(32) NOT NULL DEFAULT '',
OXPARENTID varchar(32) NOT NULL DEFAULT 'oxrootid',
OXLEFT int NOT NULL DEFAULT '0',
OXRIGHT int NOT NULL DEFAULT '0',
OXROOTID varchar(32) NOT NULL DEFAULT '',
PRIMARY KEY (OXID),
KEY OXNID (OXID),
KEY OXLEFT (OXLEFT),
KEY OXRIGHT (OXRIGHT),
KEY OXROOTID (OXROOTID)
);
INSERT INTO t1 VALUES
('d8c4177d09f8b11f5.52725521','oxrootid',1,40,'d8c4177d09f8b11f5.52725521'),
('d8c4177d151affab2.81582770','d8c4177d09f8b11f5.52725521',2,3,
'd8c4177d09f8b11f5.52725521'),
('d8c4177d206a333d2.74422679','d8c4177d09f8b11f5.52725521',4,5,
'd8c4177d09f8b11f5.52725521'),
('d8c4177d225791924.30714720','d8c4177d09f8b11f5.52725521',6,7,
'd8c4177d09f8b11f5.52725521'),
('d8c4177d2380fc201.39666693','d8c4177d09f8b11f5.52725521',8,9,
'd8c4177d09f8b11f5.52725521'),
('d8c4177d24ccef970.14957924','d8c4177d09f8b11f5.52725521',10,11,
'd8c4177d09f8b11f5.52725521');
EXPLAIN
SELECT s.oxid FROM t1 v, t1 s
WHERE s.oxrootid = 'd8c4177d09f8b11f5.52725521' AND
v.oxrootid ='d8c4177d09f8b11f5.52725521' AND
s.oxleft > v.oxleft AND s.oxleft < v.oxright;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # ALL OXLEFT NULL NULL # # Range checked for each record (index map: 0x4)
1 SIMPLE # ALL OXLEFT,OXRIGHT,OXROOTID NULL NULL # # Using where
SELECT s.oxid FROM t1 v, t1 s
WHERE s.oxrootid = 'd8c4177d09f8b11f5.52725521' AND
v.oxrootid ='d8c4177d09f8b11f5.52725521' AND
s.oxleft > v.oxleft AND s.oxleft < v.oxright;
oxid
d8c4177d151affab2.81582770
d8c4177d206a333d2.74422679
d8c4177d225791924.30714720
d8c4177d2380fc201.39666693
d8c4177d24ccef970.14957924
DROP TABLE t1;
create table t1 (
c1 char(10), c2 char(10), c3 char(10), c4 char(10),
c5 char(10), c6 char(10), c7 char(10), c8 char(10),
c9 char(10), c10 char(10), c11 char(10), c12 char(10),
c13 char(10), c14 char(10), c15 char(10), c16 char(10),
index(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12,c13,c14,c15,c16)
);
insert into t1 (c1) values ('1'),('1'),('1'),('1');
select * from t1 where
c1 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c2 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c3 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c4 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c5 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c6 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c7 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c8 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c9 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC")
and c10 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh",
"abcdefg1", "123456781", "qwertyui1", "asddfg1",
"abcdefg2", "123456782", "qwertyui2", "asddfg2",
"abcdefg3", "123456783", "qwertyui3", "asddfg3",
"abcdefg4", "123456784", "qwertyui4", "asddfg4",
"abcdefg5", "123456785", "qwertyui5", "asddfg5",
"abcdefg6", "123456786", "qwertyui6", "asddfg6",
"abcdefg7", "123456787", "qwertyui7", "asddfg7",
"abcdefg8", "123456788", "qwertyui8", "asddfg8",
"abcdefg9", "123456789", "qwertyui9", "asddfg9",
"abcdefgA", "12345678A", "qwertyuiA", "asddfgA",
"abcdefgB", "12345678B", "qwertyuiB", "asddfgB",
"abcdefgC", "12345678C", "qwertyuiC", "asddfgC");
c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c16
drop table t1;
End of 4.1 tests
CREATE TABLE t1 (
id int NOT NULL auto_increment,
status varchar(20),
PRIMARY KEY (id),
KEY (status)
);
INSERT INTO t1 VALUES
(1,'B'), (2,'B'), (3,'B'), (4,'B'), (5,'B'), (6,'B'),
(7,'B'), (8,'B'), (9,'B'), (10,'B'), (11,'B'), (12,'B'),
(13,'B'), (14,'B'), (15,'B'), (16,'B'), (17,'B'), (18,'B'),
(19,'B'), (20,'B'), (21,'B'), (22,'B'), (23,'B'), (24,'B'),
(25,'A'), (26,'A'), (27,'A'), (28,'A'), (29,'A'), (30,'A'),
(31,'A'), (32,'A'), (33,'A'), (34,'A'), (35,'A'), (36,'A'),
(37,'A'), (38,'A'), (39,'A'), (40,'A'), (41,'A'), (42,'A'),
(43,'A'), (44,'A'), (45,'A'), (46,'A'), (47,'A'), (48,'A'),
(49,'A'), (50,'A'), (51,'A'), (52,'A'), (53,'C'), (54,'C'),
(55,'C'), (56,'C'), (57,'C'), (58,'C'), (59,'C'), (60,'C');
EXPLAIN SELECT * FROM t1 WHERE status <> 'A' AND status <> 'B';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range status status 83 NULL 10 Using where; Using index
EXPLAIN SELECT * FROM t1 WHERE status NOT IN ('A','B');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range status status 83 NULL 10 Using where; Using index
SELECT * FROM t1 WHERE status <> 'A' AND status <> 'B';
id status
53 C
54 C
55 C
56 C
57 C
58 C
59 C
60 C
SELECT * FROM t1 WHERE status NOT IN ('A','B');
id status
53 C
54 C
55 C
56 C
57 C
58 C
59 C
60 C
EXPLAIN SELECT status FROM t1 WHERE status <> 'A' AND status <> 'B';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range status status 83 NULL 10 Using where; Using index
EXPLAIN SELECT status FROM t1 WHERE status NOT IN ('A','B');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range status status 83 NULL 10 Using where; Using index
EXPLAIN SELECT * FROM t1 WHERE status NOT BETWEEN 'A' AND 'B';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range status status 83 NULL 9 Using where; Using index
EXPLAIN SELECT * FROM t1 WHERE status < 'A' OR status > 'B';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range status status 83 NULL 9 Using where; Using index
SELECT * FROM t1 WHERE status NOT BETWEEN 'A' AND 'B';
id status
53 C
54 C
55 C
56 C
57 C
58 C
59 C
60 C
SELECT * FROM t1 WHERE status < 'A' OR status > 'B';
id status
53 C
54 C
55 C
56 C
57 C
58 C
59 C
60 C
DROP TABLE t1;
CREATE TABLE t1 (name varchar(15) NOT NULL, KEY idx(name));
INSERT INTO t1 VALUES ('Betty'), ('Anna');
SELECT * FROM t1;
name
Anna
Betty
DELETE FROM t1 WHERE name NOT LIKE 'A%a';
SELECT * FROM t1;
name
Anna
DROP TABLE t1;
CREATE TABLE t1 (a int, KEY idx(a));
INSERT INTO t1 VALUES (NULL), (1), (2), (3);
SELECT * FROM t1;
a
NULL
1
2
3
DELETE FROM t1 WHERE NOT(a <=> 2);
SELECT * FROM t1;
a
2
DROP TABLE t1;
create table t3 (a int);
insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a varchar(10), filler char(200), key(a));
insert into t1 values ('a','');
insert into t1 values ('a ','');
insert into t1 values ('a ', '');
insert into t1 select concat('a', 1000 + A.a + 10 * (B.a + 10 * C.a)), ''
from t3 A CROSS JOIN t3 B CROSS JOIN t3 C;
create table t2 (a varchar(10), filler char(200), key(a));
insert into t2 select * from t1;
explain select * from t1 where a between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # ref a a 43 # # Using where
explain select * from t1 where a = 'a' or a='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # ref a a 43 # # Using where
explain select * from t2 where a between 'a' and 'a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # ref a a 43 # # Using where
explain select * from t2 where a = 'a' or a='a ';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # ref a a 43 # # Using where
update t1 set a='b' where a<>'a';
explain select * from t1 where a not between 'b' and 'b';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # # # # # # # Using where
select a, hex(filler) from t1 where a not between 'b' and 'b';
a hex(filler)
a
a
a
drop table t1,t2,t3;
CREATE TABLE t1 (
id int NOT NULL DEFAULT '0',
b int NOT NULL DEFAULT '0',
c int NOT NULL DEFAULT '0',
INDEX idx1(b,c), INDEX idx2(c));
INSERT INTO t1(id) VALUES (1), (2), (3), (4), (5), (6), (7), (8);
INSERT INTO t1(b,c) VALUES (3,4), (3,4);
SELECT * FROM t1 WHERE b<=3 AND 3<=c;
id b c
0 3 4
0 3 4
SELECT * FROM t1 WHERE 3 BETWEEN b AND c;
id b c
0 3 4
0 3 4
EXPLAIN SELECT * FROM t1 WHERE b<=3 AND 3<=c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx1,idx2 idx2 4 NULL 2 Using where
EXPLAIN SELECT * FROM t1 WHERE 3 BETWEEN b AND c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx1,idx2 idx2 4 NULL 2 Using where
SELECT * FROM t1 WHERE 0 < b OR 0 > c;
id b c
0 3 4
0 3 4
SELECT * FROM t1 WHERE 0 NOT BETWEEN b AND c;
id b c
0 3 4
0 3 4
EXPLAIN SELECT * FROM t1 WHERE 0 < b OR 0 > c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL idx1,idx2 NULL NULL NULL 10 Using where
EXPLAIN SELECT * FROM t1 WHERE 0 NOT BETWEEN b AND c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL idx1,idx2 NULL NULL NULL 10 Using where
DROP TABLE t1;
CREATE TEMPORARY TABLE t1 (
item char(20) NOT NULL default '',
started datetime,
price decimal(16,3) NOT NULL default '0.000',
PRIMARY KEY (item,started)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES
('A1','2005-11-01 08:00:00',1000),
('A1','2005-11-15 00:00:00',2000),
('A1','2005-12-12 08:00:00',3000),
('A2','2005-12-01 08:00:00',1000);
EXPLAIN SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-01 23:59:59';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE # range PRIMARY PRIMARY 90 # # Using where
SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-01 23:59:59';
item started price
A1 2005-11-01 08:00:00 1000.000
A1 2005-11-15 00:00:00 2000.000
SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-02 00:00:00';
item started price
A1 2005-11-01 08:00:00 1000.000
A1 2005-11-15 00:00:00 2000.000
DROP TABLE t1;
BUG#32198 "Comparison of DATE with DATETIME still not using indexes correctly"
CREATE TABLE t1 (
id int NOT NULL auto_increment,
dateval date default NULL,
PRIMARY KEY (id),
KEY dateval (dateval)
) AUTO_INCREMENT=173;
INSERT INTO t1 VALUES
(1,'2007-01-01'),(2,'2007-01-02'),(3,'2007-01-03'),(4,'2007-01-04'),
(5,'2007-01-05'),(6,'2007-01-06'),(7,'2007-01-07'),(8,'2007-01-08'),
(9,'2007-01-09'),(10,'2007-01-10'),(11,'2007-01-11');
This must use range access:
explain select * from t1 where dateval >= '2007-01-01 00:00:00' and dateval <= '2007-01-02 23:59:59';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index dateval PRIMARY 4 NULL 11 Using where
drop table t1;
CREATE TABLE t1 (
a varchar(32), index (a)
) DEFAULT COLLATE=utf8_bin;
INSERT INTO t1 VALUES
('B'), ('A'), ('A'), ('C'), ('B'), ('A'), ('A');
SELECT a FROM t1 WHERE a='b' OR a='B';
a
B
B
EXPLAIN SELECT a FROM t1 WHERE a='b' OR a='B';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 131 NULL 3 Using where; Using index
DROP TABLE t1;
CREATE TABLE t1 (f1 int NOT NULL, PRIMARY KEY (f1));
INSERT INTO t1 VALUES (127),(254),(0),(1),(255);
SELECT COUNT(*) FROM t1 WHERE f1 < 256;
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE f1 < 256.0;
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE f1 < 255;
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE f1 < -1;
COUNT(*)
0
SELECT COUNT(*) FROM t1 WHERE f1 > -1;
COUNT(*)
5
DROP TABLE t1;
CREATE TABLE t1 ( f1 int NOT NULL, PRIMARY KEY (f1));
INSERT INTO t1 VALUES (127),(126),(0),(-128),(-127);
SELECT COUNT(*) FROM t1 WHERE f1 < 128;
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE f1 < 128.0;
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE f1 < 127;
COUNT(*)
4
SELECT COUNT(*) FROM t1 WHERE f1 > -129;
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE f1 > -129.0;
COUNT(*)
5
SELECT COUNT(*) FROM t1 WHERE f1 > -128;
COUNT(*)
4
DROP TABLE t1;
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, b int, filler char(100));
insert into t2 select A.a + 10 * (B.a + 10 * C.a), 10, 'filler' from t1 A,
t1 B, t1 C where A.a < 5;
insert into t2 select 1000, b, 'filler' from t2;
alter table t2 add index (a,b);
select 'In following EXPLAIN the access method should be ref, #rows~=500 (and not 2)' Z;
Z
In following EXPLAIN the access method should be ref, #rows~=500 (and not 2)
create temporary table t2e like t2;
alter table t2e engine=myisam;
insert into t2e select * from t2;
analyze table t2e;
Table Op Msg_type Msg_text
test.t2e analyze note The storage engine for the table doesn't support analyze
explain select * from t2e where a=1000 and b<11;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2e ref a a 5 const 11 Using where
drop table t1, t2;
End of 5.1 tests
CREATE TABLE t1 (c1 DECIMAL(10,0),INDEX(c1));
INSERT INTO t1 VALUES (1),(2),(3);
SELECT c1 FROM t1 WHERE c1 >= 'A' GROUP BY 1;
c1
1
2
3
Warnings:
Warning 1366 Incorrect decimal value: 'A' for column 'c1' at row 1
Warning 1292 Truncated incorrect DOUBLE value: 'A'
Warning 1292 Truncated incorrect DOUBLE value: 'A'
Warning 1292 Truncated incorrect DOUBLE value: 'A'
DROP TABLE t1;
create table t1 (a int,b int,key (b),key (a),key (b,a));
insert into t1(a,b) values (1,2),(3,4),(5,6),(7,8);
create table t2 (c int);
insert into t2(c) values (1),(5),(6),(7),(8);
select 1 from (select c from t1,t2 where b >= 1 and a <=> c group by 1 limit 1) as d1;
1
1
drop table t1, t2;
|