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 15 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 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 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" (
270
) ENGINE=MEMORY DEFAULT CHARSET=latin1
271
create table t2 like t1;
272
show create table t2;
274
t2 CREATE TABLE "t2" (
278
) ENGINE=MEMORY DEFAULT CHARSET=latin1
279
create table t3 select * from t1;
280
show create table t3;
282
t3 CREATE TABLE "t3" (
286
) ENGINE=MEMORY DEFAULT CHARSET=latin1
287
alter table t1 modify c varchar(10);
288
show create table t1;
290
t1 CREATE TABLE "t1" (
294
) ENGINE=MEMORY DEFAULT CHARSET=latin1
295
alter table t1 modify v char(10);
296
show create table t1;
298
t1 CREATE TABLE "t1" (
302
) ENGINE=MEMORY DEFAULT CHARSET=latin1
303
alter table t1 modify t varchar(50);
304
show create table t1;
306
t1 CREATE TABLE "t1" (
310
) ENGINE=MEMORY DEFAULT CHARSET=latin1
311
select concat('*',v,'*',c,'*',t,'*') from t1;
312
concat('*',v,'*',c,'*',t,'*')
316
create table t1 (v varchar(10), c char(10), t varchar(50), key(v), key(c), key(t(10)));
317
show create table t1;
319
t1 CREATE TABLE "t1" (
326
) ENGINE=MEMORY DEFAULT CHARSET=latin1
327
select count(*) from t1;
330
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
331
select count(*) from t1 where v='a';
334
select count(*) from t1 where c='a';
337
select count(*) from t1 where t='a';
340
select count(*) from t1 where v='a ';
343
select count(*) from t1 where c='a ';
346
select count(*) from t1 where t='a ';
349
select count(*) from t1 where v between 'a' and 'a ';
352
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
355
select count(*) from t1 where v like 'a%';
358
select count(*) from t1 where c like 'a%';
361
select count(*) from t1 where t like 'a%';
364
select count(*) from t1 where v like 'a %';
367
explain select count(*) from t1 where v='a ';
368
id select_type table type possible_keys key key_len ref rows Extra
369
1 SIMPLE t1 ref v v 13 const 10 Using where
370
explain select count(*) from t1 where c='a ';
371
id select_type table type possible_keys key key_len ref rows Extra
372
1 SIMPLE t1 ref c c 13 const 10 Using where
373
explain select count(*) from t1 where t='a ';
374
id select_type table type possible_keys key key_len ref rows Extra
375
1 SIMPLE t1 ref t t 13 const 10 Using where
376
explain select count(*) from t1 where v like 'a%';
377
id select_type table type possible_keys key key_len ref rows Extra
378
1 SIMPLE t1 ALL v NULL NULL NULL 271 Using where
379
explain select count(*) from t1 where v between 'a' and 'a ';
380
id select_type table type possible_keys key key_len ref rows Extra
381
1 SIMPLE t1 ref v v 13 const 10 Using where
382
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
383
id select_type table type possible_keys key key_len ref rows Extra
384
1 SIMPLE t1 ref v v 13 const 10 Using where
385
alter table t1 add unique(v);
386
ERROR 23000: Duplicate entry '{ ' for key 'v_2'
387
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));
399
explain select * from t1 where v='a';
400
id select_type table type possible_keys key key_len ref rows Extra
401
1 SIMPLE t1 ref v v 13 const 10 Using where
402
select v,count(*) from t1 group by v limit 10;
414
select v,count(t) from t1 group by v limit 10;
426
select v,count(c) from t1 group by v limit 10;
438
select sql_big_result trim(v),count(t) from t1 group by v limit 10;
450
select sql_big_result trim(v),count(c) from t1 group by v limit 10;
462
select c,count(*) from t1 group by c limit 10;
474
select c,count(t) from t1 group by c limit 10;
486
select sql_big_result c,count(t) from t1 group by c limit 10;
498
select t,count(*) from t1 group by t limit 10;
510
select t,count(t) from t1 group by t limit 10;
522
select sql_big_result trim(t),count(t) from t1 group by t limit 10;
535
create table t1 (a char(10), unique (a));
536
insert into t1 values ('a');
537
insert into t1 values ('a ');
538
ERROR 23000: Duplicate entry 'a ' for key 'a'
539
alter table t1 modify a varchar(10);
540
insert into t1 values ('a '),('a '),('a '),('a ');
541
ERROR 23000: Duplicate entry 'a ' for key 'a'
542
insert into t1 values ('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
update t1 set a='a ' where a like 'a ';
549
update t1 set a='a ' where a like 'a ';
551
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)));
552
show create table t1;
554
t1 CREATE TABLE "t1" (
558
KEY "v" ("v") USING BTREE,
559
KEY "c" ("c") USING BTREE,
560
KEY "t" ("t"(10)) USING BTREE
561
) ENGINE=MEMORY DEFAULT CHARSET=latin1
562
select count(*) from t1;
565
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
566
select count(*) from t1 where v='a';
569
select count(*) from t1 where c='a';
572
select count(*) from t1 where t='a';
575
select count(*) from t1 where v='a ';
578
select count(*) from t1 where c='a ';
581
select count(*) from t1 where t='a ';
584
select count(*) from t1 where v between 'a' and 'a ';
587
select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
590
explain select count(*) from t1 where v='a ';
591
id select_type table type possible_keys key key_len ref rows Extra
592
1 SIMPLE t1 ref v v 13 const # Using where
593
explain select count(*) from t1 where c='a ';
594
id select_type table type possible_keys key key_len ref rows Extra
595
1 SIMPLE t1 ref c c 13 const # Using where
596
explain select count(*) from t1 where t='a ';
597
id select_type table type possible_keys key key_len ref rows Extra
598
1 SIMPLE t1 ref t t 13 const # Using where
599
explain select count(*) from t1 where v like 'a%';
600
id select_type table type possible_keys key key_len ref rows Extra
601
1 SIMPLE t1 range v v 13 NULL # Using where
602
explain select count(*) from t1 where v between 'a' and 'a ';
603
id select_type table type possible_keys key key_len ref rows Extra
604
1 SIMPLE t1 ref v v 13 const # Using where
605
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a ' and 'b\n';
606
id select_type table type possible_keys key key_len ref rows Extra
607
1 SIMPLE t1 ref v v 13 const # Using where
608
alter table t1 add unique(v);
609
ERROR 23000: Duplicate entry '{ ' for key 'v_2'
610
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));
622
explain select * from t1 where v='a';
623
id select_type table type possible_keys key key_len ref rows Extra
624
1 SIMPLE t1 ref v v 13 const # Using where
626
create table t1 (a char(10), unique using btree (a)) engine=heap;
627
insert into t1 values ('a');
628
insert into t1 values ('a ');
629
ERROR 23000: Duplicate entry 'a ' for key 'a'
630
alter table t1 modify a varchar(10);
631
insert into t1 values ('a '),('a '),('a '),('a ');
632
ERROR 23000: Duplicate entry 'a ' for key 'a'
633
insert into t1 values ('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
update t1 set a='a ' where a like 'a ';
640
update t1 set a='a ' where a like 'a ';
642
create table t1 (v varchar(10), c char(10), t varchar(50), key(v(5)), key(c(5)), key(t(5)));
643
show create table t1;
645
t1 CREATE TABLE "t1" (
652
) ENGINE=MEMORY DEFAULT CHARSET=latin1
654
create table t1 (v varchar(65530), key(v(10)));
655
show create table t1;
657
t1 CREATE TABLE "t1" (
660
) ENGINE=MEMORY DEFAULT CHARSET=latin1
661
insert into t1 values(repeat('a',65530));
662
select length(v) from t1 where v=repeat('a',65530);
666
set storage_engine=InnoDB;
667
create table t1 (a bigint unsigned auto_increment primary key, b int,
668
key (b, a)) engine=heap;
669
insert t1 (b) values (1),(1),(1),(1),(1),(1),(1),(1);
681
create table t1 (a int not null, b int not null auto_increment,
682
primary key(a, b), key(b)) engine=heap;
683
insert t1 (a) values (1),(1),(1),(1),(1),(1),(1),(1);
695
create table t1 (a int not null, b int not null auto_increment,
696
primary key(a, b)) engine=heap;
697
ERROR 42000: Incorrect table definition; there can be only one auto column and it must be defined as a key
698
create table t1 (c char(255), primary key(c(90)));
699
insert into t1 values ("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
700
insert into t1 values ("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
701
ERROR 23000: Duplicate entry 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl' for key 'PRIMARY'
703
CREATE TABLE t1 (a int, key(a)) engine=heap;
704
insert into t1 values (0);
708
insert into t1 values (0), (1);
709
select * from t1 where a = 0;
713
create table t1 (c char(10)) engine=memory;
714
create table t2 (c varchar(10)) engine=memory;
715
show table status like 't_';
716
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
717
t1 MEMORY 10 Fixed 0 12 0 # 0 0 NULL NULL NULL NULL latin1_swedish_ci NULL
718
t2 MEMORY 10 Fixed 0 12 0 # 0 0 NULL NULL NULL NULL latin1_swedish_ci NULL
720
CREATE TABLE t1(a VARCHAR(1), b VARCHAR(2), c VARCHAR(256),
721
KEY(a), KEY(b), KEY(c)) ENGINE=MEMORY;
722
INSERT INTO t1 VALUES('a','aa',REPEAT('a', 256)),('a','aa',REPEAT('a',256));
723
SELECT COUNT(*) FROM t1 WHERE a='a';
726
SELECT COUNT(*) FROM t1 WHERE b='aa';
729
SELECT COUNT(*) FROM t1 WHERE c=REPEAT('a',256);
733
CREATE TABLE t1(c1 VARCHAR(100), c2 INT) ENGINE=MEMORY;
734
INSERT INTO t1 VALUES('', 0);
735
ALTER TABLE t1 MODIFY c1 VARCHAR(101);