1
drop table if exists t1,t2,t3;
2
create table t1 (a int not null,b int not null, primary key (a)) engine=heap comment="testing heaps" avg_row_length=100 min_rows=1 max_rows=100;
3
insert into t1 values(1,1),(2,2),(3,3),(4,4);
4
delete from t1 where a=1 or a=0;
6
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_Comment
7
t1 0 PRIMARY 1 a NULL 3 NULL NULL HASH
13
select * from t1 where a=4;
16
update t1 set b=5 where a=4;
17
update t1 set b=b+1 where a>=3;
18
replace t1 values (3,3);
24
alter table t1 add c int not null, add key (c,a);
26
create table t1 (a int not null,b int not null, primary key (a)) engine=memory comment="testing heaps";
27
insert into t1 values(1,1),(2,2),(3,3),(4,4);
28
delete from t1 where a > 0;
32
create table t1 (a int not null,b int not null, primary key (a)) engine=heap comment="testing heaps";
33
insert into t1 values(1,1),(2,2),(3,3),(4,4);
34
alter table t1 modify a int not null auto_increment, engine=myisam, comment="new myisam table";
42
create table t1 (a int not null) engine=heap;
43
insert into t1 values (869751),(736494),(226312),(802616),(728912);
44
select * from t1 where a > 736494;
48
alter table t1 add unique uniq_id(a);
49
select * from t1 where a > 736494;
53
select * from t1 where a = 736494;
56
select * from t1 where a=869751 or a=736494;
60
select * from t1 where a in (869751,736494,226312,802616);
66
alter table t1 engine=myisam;
67
explain select * from t1 where a in (869751,736494,226312,802616);
68
id select_type table type possible_keys key key_len ref rows Extra
69
1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 Using where; Using index
71
create table t1 (x int not null, y int not null, key x (x), unique y (y))
73
insert into t1 values (1,1),(2,2),(1,3),(2,4),(2,5),(2,6);
74
select * from t1 where x=1;
78
select * from t1,t1 as t2 where t1.x=t2.y;
86
explain select * from t1,t1 as t2 where t1.x=t2.y;
87
id select_type table type possible_keys key key_len ref rows Extra
88
1 SIMPLE t1 ALL x NULL NULL NULL 6
89
1 SIMPLE t2 eq_ref y y 4 test.t1.x 1
91
create table t1 (a int) engine=heap;
92
insert into t1 values(1);
93
select max(a) from t1;
97
CREATE TABLE t1 ( a int not null default 0, b int not null default 0, key(a), key(b) ) ENGINE=HEAP;
98
insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
99
select * from t1 where a=1;
107
insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
108
select * from t1 where a=1;
123
create table t1 (id int unsigned not null, primary key (id)) engine=HEAP;
124
insert into t1 values(1);
125
select max(id) from t1;
128
insert into t1 values(2);
129
select max(id) from t1;
132
replace into t1 values(1);
134
create table t1 (n int) engine=heap;
136
create table t1 (n int) engine=heap;
137
drop table if exists t1;
138
CREATE table t1(f1 int not null,f2 char(20) not
139
null,index(f2)) engine=heap;
140
INSERT into t1 set f1=12,f2="bill";
141
INSERT into t1 set f1=13,f2="bill";
142
INSERT into t1 set f1=14,f2="bill";
143
INSERT into t1 set f1=15,f2="bill";
144
INSERT into t1 set f1=16,f2="ted";
145
INSERT into t1 set f1=12,f2="ted";
146
INSERT into t1 set f1=12,f2="ted";
147
INSERT into t1 set f1=12,f2="ted";
148
INSERT into t1 set f1=12,f2="ted";
149
delete from t1 where f2="bill";
158
create table t1 (btn char(10) not null, key(btn)) engine=heap;
159
insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
160
explain select * from t1 where btn like "q%";
161
id select_type table type possible_keys key key_len ref rows Extra
162
1 SIMPLE t1 ALL btn NULL NULL NULL 14 Using where
163
select * from t1 where btn like "q%";
165
alter table t1 add column new_col char(1) not null, add key (btn,new_col), drop key btn;
166
update t1 set new_col=left(btn,1);
167
explain select * from t1 where btn="a";
168
id select_type table type possible_keys key key_len ref rows Extra
169
1 SIMPLE t1 ALL btn NULL NULL NULL 14 Using where
170
explain select * from t1 where btn="a" and new_col="a";
171
id select_type table type possible_keys key key_len ref rows Extra
172
1 SIMPLE t1 ref btn btn 11 const,const 2 Using where
180
INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
181
SELECT * FROM t1 WHERE a=NULL;
183
explain SELECT * FROM t1 WHERE a IS NULL;
184
id select_type table type possible_keys key key_len ref rows Extra
185
1 SIMPLE t1 ref a a 5 const 2 Using where
186
SELECT * FROM t1 WHERE a<=>NULL;
189
SELECT * FROM t1 WHERE b=NULL;
191
explain SELECT * FROM t1 WHERE b IS NULL;
192
id select_type table type possible_keys key key_len ref rows Extra
193
1 SIMPLE t1 ref b b 5 const 1 Using where
194
SELECT * FROM t1 WHERE b<=>NULL;
197
INSERT INTO t1 VALUES (1,3);
198
ERROR 23000: Duplicate entry '3' for key 'b'
204
INSERT INTO t1 VALUES (10), (10), (10);
205
EXPLAIN SELECT * FROM t1 WHERE a=10;
206
id select_type table type possible_keys key key_len ref rows Extra
207
1 SIMPLE t1 ref a a 5 const 3
208
SELECT * FROM t1 WHERE a=10;
214
CREATE TABLE t1 (a int not null, primary key(a)) engine=heap;
215
INSERT into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11);
216
DELETE from t1 where a < 100;
220
CREATE TABLE `job_titles` (
221
`job_title_id` int(6) unsigned NOT NULL default '0',
222
`job_title` char(18) NOT NULL default '',
223
PRIMARY KEY (`job_title_id`),
224
UNIQUE KEY `job_title_id` (`job_title_id`,`job_title`)
226
SELECT MAX(job_title_id) FROM job_titles;
229
DROP TABLE job_titles;
230
CREATE TABLE t1 (a INT NOT NULL, B INT, KEY(B)) ENGINE=HEAP;
231
INSERT INTO t1 VALUES(1,1), (1,NULL);
232
SELECT * FROM t1 WHERE B is not null;
236
CREATE TABLE t1 (pseudo char(35) PRIMARY KEY, date int(10) unsigned NOT NULL) ENGINE=HEAP;
237
INSERT INTO t1 VALUES ('massecot',1101106491),('altec',1101106492),('stitch+',1101106304),('Seb Corgan',1101106305),('beerfilou',1101106263),('flaker',1101106529),('joce8',5),('M4vrick',1101106418),('gabay008',1101106525),('Vamp irX',1101106291),('ZoomZip',1101106546),('rip666',1101106502),('CBP ',1101106397),('guezpard',1101106496);
238
DELETE FROM t1 WHERE date<1101106546;
243
create table t1(a char(2)) engine=memory;
244
insert into t1 values (NULL), (NULL);
245
delete from t1 where a is null;
246
insert into t1 values ('2'), ('3');
252
set storage_engine=HEAP;
253
create table t1 (v varchar(10), c char(10), t varchar(50));
254
insert into t1 values('+ ', '+ ', '+ ');
255
set @a=repeat(' ',20);
256
insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
258
Note 1265 Data truncated for column 'v' at row 1
259
Note 1265 Data truncated for column 'c' at row 1
260
select concat('*',v,'*',c,'*',t,'*') from t1;
261
concat('*',v,'*',c,'*',t,'*')
264
show create table t1;
266
t1 CREATE TABLE `t1` (
267
`v` varchar(10) DEFAULT NULL,
268
`c` char(10) DEFAULT NULL,
269
`t` varchar(50) DEFAULT NULL
270
) ENGINE=MEMORY DEFAULT CHARSET=latin1
271
create table t2 like t1;
272
show create table t2;
274
t2 CREATE TABLE `t2` (
275
`v` varchar(10) DEFAULT NULL,
276
`c` char(10) DEFAULT NULL,
277
`t` varchar(50) DEFAULT NULL
278
) ENGINE=MEMORY DEFAULT CHARSET=latin1
279
create table t3 select * from t1;
280
show create table t3;
282
t3 CREATE TABLE `t3` (
283
`v` varchar(10) DEFAULT NULL,
284
`c` char(10) DEFAULT NULL,
285
`t` varchar(50) DEFAULT NULL
286
) ENGINE=MEMORY DEFAULT CHARSET=latin1
287
alter table t1 modify c varchar(10);
288
show create table t1;
290
t1 CREATE TABLE `t1` (
291
`v` varchar(10) DEFAULT NULL,
292
`c` varchar(10) DEFAULT NULL,
293
`t` varchar(50) DEFAULT NULL
294
) ENGINE=MEMORY DEFAULT CHARSET=latin1
295
alter table t1 modify v char(10);
296
show create table t1;
298
t1 CREATE TABLE `t1` (
299
`v` char(10) DEFAULT NULL,
300
`c` varchar(10) DEFAULT NULL,
301
`t` varchar(50) DEFAULT NULL
302
) ENGINE=MEMORY DEFAULT CHARSET=latin1
303
alter table t1 modify t varchar(10);
305
Warning 1265 Data truncated for column 't' at row 2
306
show create table t1;
308
t1 CREATE TABLE `t1` (
309
`v` char(10) DEFAULT NULL,
310
`c` varchar(10) DEFAULT NULL,
311
`t` varchar(10) DEFAULT NULL
312
) ENGINE=MEMORY DEFAULT CHARSET=latin1
313
select concat('*',v,'*',c,'*',t,'*') from t1;
314
concat('*',v,'*',c,'*',t,'*')
318
create table t1 (v varchar(10), c char(10), t varchar(50), key(v), key(c), key(t(10)));
319
show create table t1;
321
t1 CREATE TABLE `t1` (
322
`v` varchar(10) DEFAULT NULL,
323
`c` char(10) DEFAULT NULL,
324
`t` varchar(50) DEFAULT NULL,
328
) ENGINE=MEMORY DEFAULT CHARSET=latin1
329
select count(*) from t1;
332
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
333
select count(*) from t1 where v='a';
336
select count(*) from t1 where c='a';
339
select count(*) from t1 where t='a';
342
select count(*) from t1 where v='a ';
345
select count(*) from t1 where c='a ';
348
select count(*) from t1 where t='a ';
351
select count(*) from t1 where v between 'a' and 'a ';
354
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
357
select count(*) from t1 where v like 'a%';
360
select count(*) from t1 where c like 'a%';
363
select count(*) from t1 where t like 'a%';
366
select count(*) from t1 where v like 'a %';
369
explain select count(*) from t1 where v='a ';
370
id select_type table type possible_keys key key_len ref rows Extra
371
1 SIMPLE t1 ref v v 13 const 10 Using where
372
explain select count(*) from t1 where c='a ';
373
id select_type table type possible_keys key key_len ref rows Extra
374
1 SIMPLE t1 ref c c 11 const 10 Using where
375
explain select count(*) from t1 where t='a ';
376
id select_type table type possible_keys key key_len ref rows Extra
377
1 SIMPLE t1 ref t t 13 const 10 Using where
378
explain select count(*) from t1 where v like 'a%';
379
id select_type table type possible_keys key key_len ref rows Extra
380
1 SIMPLE t1 ALL v NULL NULL NULL 271 Using where
381
explain select count(*) from t1 where v between 'a' and 'a ';
382
id select_type table type possible_keys key key_len ref rows Extra
383
1 SIMPLE t1 ref v v 13 const 10 Using where
384
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
385
id select_type table type possible_keys key key_len ref rows Extra
386
1 SIMPLE t1 ref v v 13 const 10 Using where
387
alter table t1 add unique(v);
388
ERROR 23000: Duplicate entry '{ ' for key 'v_2'
389
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));
401
explain select * from t1 where v='a';
402
id select_type table type possible_keys key key_len ref rows Extra
403
1 SIMPLE t1 ref v v 13 const 10 Using where
404
select v,count(*) from t1 group by v limit 10;
416
select v,count(t) from t1 group by v limit 10;
428
select v,count(c) from t1 group by v limit 10;
440
select sql_big_result trim(v),count(t) from t1 group by v limit 10;
452
select sql_big_result trim(v),count(c) from t1 group by v limit 10;
464
select c,count(*) from t1 group by c limit 10;
476
select c,count(t) from t1 group by c limit 10;
488
select sql_big_result c,count(t) from t1 group by c limit 10;
500
select t,count(*) from t1 group by t limit 10;
512
select t,count(t) from t1 group by t limit 10;
524
select sql_big_result trim(t),count(t) from t1 group by t limit 10;
537
create table t1 (a char(10), unique (a));
538
insert into t1 values ('a');
539
insert into t1 values ('a ');
540
ERROR 23000: Duplicate entry 'a' for key 'a'
541
alter table t1 modify a varchar(10);
542
insert into t1 values ('a '),('a '),('a '),('a ');
543
ERROR 23000: Duplicate entry 'a ' for key 'a'
544
insert into t1 values ('a ');
545
ERROR 23000: Duplicate entry 'a ' for key 'a'
546
insert into t1 values ('a ');
547
ERROR 23000: Duplicate entry 'a ' for key 'a'
548
insert into t1 values ('a ');
549
ERROR 23000: Duplicate entry 'a ' for key 'a'
550
update t1 set a='a ' where a like 'a ';
551
update t1 set a='a ' where a like 'a ';
553
create table t1 (v varchar(10), c char(10), t varchar(50), key using btree (v), key using btree (c), key using btree (t(10)));
554
show create table t1;
556
t1 CREATE TABLE `t1` (
557
`v` varchar(10) DEFAULT NULL,
558
`c` char(10) DEFAULT NULL,
559
`t` varchar(50) DEFAULT NULL,
560
KEY `v` (`v`) USING BTREE,
561
KEY `c` (`c`) USING BTREE,
562
KEY `t` (`t`(10)) USING BTREE
563
) ENGINE=MEMORY DEFAULT CHARSET=latin1
564
select count(*) from t1;
567
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
568
select count(*) from t1 where v='a';
571
select count(*) from t1 where c='a';
574
select count(*) from t1 where t='a';
577
select count(*) from t1 where v='a ';
580
select count(*) from t1 where c='a ';
583
select count(*) from t1 where t='a ';
586
select count(*) from t1 where v between 'a' and 'a ';
589
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
592
explain select count(*) from t1 where v='a ';
593
id select_type table type possible_keys key key_len ref rows Extra
594
1 SIMPLE t1 ref v v 13 const # Using where
595
explain select count(*) from t1 where c='a ';
596
id select_type table type possible_keys key key_len ref rows Extra
597
1 SIMPLE t1 ref c c 11 const # Using where
598
explain select count(*) from t1 where t='a ';
599
id select_type table type possible_keys key key_len ref rows Extra
600
1 SIMPLE t1 ref t t 13 const # Using where
601
explain select count(*) from t1 where v like 'a%';
602
id select_type table type possible_keys key key_len ref rows Extra
603
1 SIMPLE t1 range v v 13 NULL # Using where
604
explain select count(*) from t1 where v between 'a' and 'a ';
605
id select_type table type possible_keys key key_len ref rows Extra
606
1 SIMPLE t1 ref v v 13 const # Using where
607
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
608
id select_type table type possible_keys key key_len ref rows Extra
609
1 SIMPLE t1 ref v v 13 const # Using where
610
alter table t1 add unique(v);
611
ERROR 23000: Duplicate entry '{ ' for key 'v_2'
612
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));
624
explain select * from t1 where v='a';
625
id select_type table type possible_keys key key_len ref rows Extra
626
1 SIMPLE t1 ref v v 13 const # Using where
628
create table t1 (a char(10), unique using btree (a)) engine=heap;
629
insert into t1 values ('a');
630
insert into t1 values ('a ');
631
ERROR 23000: Duplicate entry 'a' for key 'a'
632
alter table t1 modify a varchar(10);
633
insert into t1 values ('a '),('a '),('a '),('a ');
634
ERROR 23000: Duplicate entry 'a ' for key 'a'
635
insert into t1 values ('a ');
636
ERROR 23000: Duplicate entry 'a ' for key 'a'
637
insert into t1 values ('a ');
638
ERROR 23000: Duplicate entry 'a ' for key 'a'
639
insert into t1 values ('a ');
640
ERROR 23000: Duplicate entry 'a ' for key 'a'
641
update t1 set a='a ' where a like 'a ';
642
update t1 set a='a ' where a like 'a ';
644
create table t1 (v varchar(10), c char(10), t varchar(50), key(v(5)), key(c(5)), key(t(5)));
645
show create table t1;
647
t1 CREATE TABLE `t1` (
648
`v` varchar(10) DEFAULT NULL,
649
`c` char(10) DEFAULT NULL,
650
`t` varchar(50) DEFAULT NULL,
654
) ENGINE=MEMORY DEFAULT CHARSET=latin1
656
create table t1 (v varchar(65530), key(v(10)));
657
show create table t1;
659
t1 CREATE TABLE `t1` (
660
`v` varchar(65530) DEFAULT NULL,
662
) ENGINE=MEMORY DEFAULT CHARSET=latin1
663
insert into t1 values(repeat('a',65530));
664
select length(v) from t1 where v=repeat('a',65530);
668
set storage_engine=MyISAM;
669
create table t1 (a bigint unsigned auto_increment primary key, b int,
670
key (b, a)) engine=heap;
671
insert t1 (b) values (1),(1),(1),(1),(1),(1),(1),(1);
683
create table t1 (a int not null, b int not null auto_increment,
684
primary key(a, b), key(b)) engine=heap;
685
insert t1 (a) values (1),(1),(1),(1),(1),(1),(1),(1);
697
create table t1 (a int not null, b int not null auto_increment,
698
primary key(a, b)) engine=heap;
699
ERROR 42000: Incorrect table definition; there can be only one auto column and it must be defined as a key
700
create table t1 (c char(255), primary key(c(90)));
701
insert into t1 values ("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
702
insert into t1 values ("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
703
ERROR 23000: Duplicate entry 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl' for key 'PRIMARY'
705
CREATE TABLE t1 (a int, key(a)) engine=heap;
706
insert into t1 values (0);
710
insert into t1 values (0), (1);
711
select * from t1 where a = 0;
715
create table t1 (c char(10)) engine=memory;
716
create table t2 (c varchar(10)) engine=memory;
717
show table status like 't_';
718
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment
719
t1 MEMORY 10 Fixed 0 11 0 # 0 0 NULL NULL NULL NULL latin1_swedish_ci NULL
720
t2 MEMORY 10 Fixed 0 12 0 # 0 0 NULL NULL NULL NULL latin1_swedish_ci NULL
722
CREATE TABLE t1(a VARCHAR(1), b VARCHAR(2), c VARCHAR(256),
723
KEY(a), KEY(b), KEY(c)) ENGINE=MEMORY;
724
INSERT INTO t1 VALUES('a','aa',REPEAT('a', 256)),('a','aa',REPEAT('a',256));
725
SELECT COUNT(*) FROM t1 WHERE a='a';
728
SELECT COUNT(*) FROM t1 WHERE b='aa';
731
SELECT COUNT(*) FROM t1 WHERE c=REPEAT('a',256);
735
CREATE TABLE t1(c1 VARCHAR(100), c2 INT) ENGINE=MEMORY;
736
INSERT INTO t1 VALUES('', 0);
737
ALTER TABLE t1 MODIFY c1 VARCHAR(101);