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drop table if exists t1;
create table t1 (a int not null,b int not null, primary key using BTREE (a)) engine=heap comment="testing heaps" avg_row_length=100 min_rows=1 max_rows=100;
insert into t1 values(1,1),(2,2),(3,3),(4,4);
delete from t1 where a=1 or a=0;
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Visible Expression
t1 0 PRIMARY 1 a A NULL NULL NULL BTREE YES NULL
select * from t1;
a b
2 2
3 3
4 4
select * from t1 where a=4;
a b
4 4
update t1 set b=5 where a=4;
update t1 set b=b+1 where a>=3;
replace t1 values (3,3);
select * from t1;
a b
2 2
3 3
4 6
alter table t1 add c int not null, add key using BTREE (c,a);
drop table t1;
create table t1 (a int not null,b int not null, primary key using BTREE (a)) engine=heap comment="testing heaps";
insert into t1 values(-2,-2),(-1,-1),(0,0),(1,1),(2,2),(3,3),(4,4);
delete from t1 where a > -3;
select * from t1;
a b
drop table t1;
create table t1 (x int not null, y int not null, key x using BTREE (x,y), unique y using BTREE (y))
engine=heap;
insert into t1 values (1,1),(2,2),(1,3),(2,4),(2,5),(2,6);
explain select * from t1 where x=1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref x x 4 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`x` AS `x`,`test`.`t1`.`y` AS `y` from `test`.`t1` where (`test`.`t1`.`x` = 1)
select * from t1 where x=1;
x y
1 1
1 3
select * from t1,t1 as t2 where t1.x=t2.y;
x y x y
1 1 1 1
1 3 1 1
2 2 2 2
2 4 2 2
2 5 2 2
2 6 2 2
explain select * from t1,t1 as t2 where t1.x=t2.y;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL x NULL NULL NULL 6 100.00 NULL
1 SIMPLE t2 NULL eq_ref y y 4 test.t1.x 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`x` AS `x`,`test`.`t1`.`y` AS `y`,`test`.`t2`.`x` AS `x`,`test`.`t2`.`y` AS `y` from `test`.`t1` join `test`.`t1` `t2` where (`test`.`t2`.`y` = `test`.`t1`.`x`)
drop table t1;
create table t1 (a int) engine=heap;
insert into t1 values(1);
select max(a) from t1;
max(a)
1
drop table t1;
CREATE TABLE t1 ( a int not null default 0, b int not null default 0, key using BTREE (a,b), key using BTREE (b) ) ENGINE=HEAP;
insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
select * from t1 where a=1;
a b
1 1
1 2
1 3
1 4
1 5
1 6
insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
select * from t1 where a=1;
a b
1 1
1 1
1 2
1 2
1 3
1 3
1 4
1 4
1 5
1 5
1 6
1 6
explain select * from tx where a=x order by a,b;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
x SIMPLE tx NULL ref a a x const x xx.xx NULL
Warnings:
Note xxx /* select#x */ select `test`.`tx`.`a` AS `a`,`test`.`tx`.`b` AS `b` from `test`.`tx` where (`test`.`tx`.`a` = x) order by `test`.`tx`.`a`,`test`.`tx`.`b`
explain select * from tx where a=x order by b;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
x SIMPLE tx NULL ref a a x const x xx.xx NULL
Warnings:
Note xxx /* select#x */ select `test`.`tx`.`a` AS `a`,`test`.`tx`.`b` AS `b` from `test`.`tx` where (`test`.`tx`.`a` = x) order by `test`.`tx`.`b`
select * from t1 where b=1;
a b
1 1
1 1
explain select * from tx where b=x;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
x SIMPLE tx NULL ref b b x const x xx.xx NULL
Warnings:
Note xxx /* select#x */ select `test`.`tx`.`a` AS `a`,`test`.`tx`.`b` AS `b` from `test`.`tx` where (`test`.`tx`.`b` = x)
drop table t1;
create table t1 (id int unsigned not null, primary key using BTREE (id)) engine=HEAP;
insert into t1 values(1);
select max(id) from t1;
max(id)
1
insert into t1 values(2);
select max(id) from t1;
max(id)
2
replace into t1 values(1);
drop table t1;
create table t1 (n int) engine=heap;
drop table t1;
create table t1 (n int) engine=heap;
drop table if exists t1;
CREATE table t1(f1 int not null,f2 char(20) not
null,index(f2)) engine=heap;
INSERT into t1 set f1=12,f2="bill";
INSERT into t1 set f1=13,f2="bill";
INSERT into t1 set f1=14,f2="bill";
INSERT into t1 set f1=15,f2="bill";
INSERT into t1 set f1=16,f2="ted";
INSERT into t1 set f1=12,f2="ted";
INSERT into t1 set f1=12,f2="ted";
INSERT into t1 set f1=12,f2="ted";
INSERT into t1 set f1=12,f2="ted";
delete from t1 where f2="bill";
select * from t1;
f1 f2
16 ted
12 ted
12 ted
12 ted
12 ted
drop table t1;
create table t1 (btn char(10) not null, key using BTREE (btn)) charset utf8mb4 engine=heap;
insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
explain select * from t1 where btn like "i%";
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range btn btn 40 NULL 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`btn` AS `btn` from `test`.`t1` where (`test`.`t1`.`btn` like 'i%')
explain select * from t1 where btn like "h%";
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range btn btn 40 NULL # 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`btn` AS `btn` from `test`.`t1` where (`test`.`t1`.`btn` like 'h%')
explain select * from t1 where btn like "a%";
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range btn btn 40 NULL 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`btn` AS `btn` from `test`.`t1` where (`test`.`t1`.`btn` like 'a%')
explain select * from t1 where btn like "b%";
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range btn btn 40 NULL 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`btn` AS `btn` from `test`.`t1` where (`test`.`t1`.`btn` like 'b%')
select * from t1 where btn like "ff%";
btn
select * from t1 where btn like " %";
btn
select * from t1 where btn like "q%";
btn
alter table t1 add column new_col char(1) not null, add key using BTREE (btn,new_col), drop key btn;
update t1 set new_col=left(btn,1);
explain select * from t1 where btn="a";
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref btn btn 40 const 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`btn` AS `btn`,`test`.`t1`.`new_col` AS `new_col` from `test`.`t1` where (`test`.`t1`.`btn` = 'a')
explain select * from t1 where btn="a" and new_col="a";
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref btn btn 44 const,const 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`btn` AS `btn`,`test`.`t1`.`new_col` AS `new_col` from `test`.`t1` where ((`test`.`t1`.`new_col` = 'a') and (`test`.`t1`.`btn` = 'a'))
drop table t1;
CREATE TABLE t1 (
a int default NULL,
b int default NULL,
KEY a using BTREE (a),
UNIQUE b using BTREE (b)
) engine=heap;
INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
SELECT * FROM t1 WHERE a=NULL;
a b
explain SELECT * FROM t1 WHERE a IS NULL;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref a a 5 const 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` is null)
SELECT * FROM t1 WHERE a<=>NULL;
a b
NULL 99
SELECT * FROM t1 WHERE b=NULL;
a b
explain SELECT * FROM t1 WHERE b IS NULL;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref b b 5 const 1 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`b` is null)
SELECT * FROM t1 WHERE b<=>NULL;
a b
99 NULL
INSERT INTO t1 VALUES (1,3);
ERROR 23000: Duplicate entry '3' for key 't1.b'
DROP TABLE t1;
CREATE TABLE t1 (a int, b int, c int, key using BTREE (a, b, c)) engine=heap;
INSERT INTO t1 VALUES (1, NULL, NULL), (1, 1, NULL), (1, NULL, 1);
SELECT * FROM t1 WHERE a=1 and b IS NULL;
a b c
1 NULL NULL
1 NULL 1
SELECT * FROM t1 WHERE a=1 and c IS NULL;
a b c
1 NULL NULL
1 1 NULL
SELECT * FROM t1 WHERE a=1 and b IS NULL and c IS NULL;
a b c
1 NULL NULL
DROP TABLE t1;
CREATE TABLE t1 (a int not null, primary key using BTREE (a)) engine=heap;
INSERT into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11);
DELETE from t1 where a < 100;
SELECT * from t1;
a
DROP TABLE t1;
create table t1(a int not null, key using btree(a)) engine=heap;
insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
select a from t1 where a > 2 order by a;
a
3
3
3
3
delete from t1 where a < 4;
select a from t1 order by a;
a
insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
select a from t1 where a > 4 order by a;
a
delete from t1 where a > 4;
select a from t1 order by a;
a
1
1
2
2
2
3
3
3
3
select a from t1 where a > 3 order by a;
a
delete from t1 where a >= 2;
select a from t1 order by a;
a
1
1
drop table t1;
CREATE TABLE t1 (
c1 CHAR(3),
c2 INTEGER,
KEY USING BTREE(c1),
KEY USING BTREE(c2)
) ENGINE= MEMORY;
INSERT INTO t1 VALUES ('ABC',0), ('A',0), ('B',0), ('C',0);
UPDATE t1 SET c2= c2 + 1 WHERE c1 = 'A';
SELECT * FROM t1;
c1 c2
ABC 0
A 1
B 0
C 0
DROP TABLE t1;
CREATE TABLE t1 (
c1 ENUM('1', '2'),
UNIQUE USING BTREE(c1)
) ENGINE= MEMORY DEFAULT CHARSET= utf8;
Warnings:
Warning 3719 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
INSERT INTO t1 VALUES('1'), ('2');
DROP TABLE t1;
CREATE TABLE t1 (
c1 SET('1', '2'),
UNIQUE USING BTREE(c1)
) ENGINE= MEMORY DEFAULT CHARSET= utf8;
Warnings:
Warning 3719 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
INSERT INTO t1 VALUES('1'), ('2');
DROP TABLE t1;
CREATE TABLE t1 (a INT, KEY USING BTREE(a)) ENGINE=MEMORY;
INSERT INTO t1 VALUES(1),(2),(2);
DELETE FROM t1 WHERE a=2;
SELECT * FROM t1;
a
1
DROP TABLE t1;
End of 4.1 tests
CREATE TABLE t1(val INT, KEY USING BTREE(val)) ENGINE=memory;
INSERT INTO t1 VALUES(0);
SELECT INDEX_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='t1';
INDEX_LENGTH
21
UPDATE t1 SET val=1;
SELECT INDEX_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='t1';
INDEX_LENGTH
21
DROP TABLE t1;
CREATE TABLE t1 (a INT, UNIQUE USING BTREE(a)) ENGINE=MEMORY;
INSERT INTO t1 VALUES(NULL),(NULL);
DROP TABLE t1;
create table t1(a varchar(255), b varchar(255),
key using btree (a,b)) engine=memory;
insert into t1 values (1, 1), (3, 3), (2, 2), (NULL, 1), (NULL, NULL), (0, 0);
select * from t1 where a is null;
a b
NULL 1
NULL NULL
drop table t1;
#
# bug#39918 - memory (heap) engine crashing while executing self join with delete
#
CREATE TABLE t1(a INT, KEY USING BTREE (a)) ENGINE=MEMORY;
INSERT INTO t1 VALUES(1),(1);
DELETE a1 FROM t1 AS a1, t1 AS a2 WHERE a1.a=a2.a;
DROP TABLE t1;
End of 5.0 tests
# Bug#24364448: Check that btree indexes may be used to provide ordering
CREATE TABLE t1(
id INT AUTO_INCREMENT PRIMARY KEY,
c1 INT NOT NULL,
c2 INT NOT NULL,
UNIQUE KEY USING BTREE (c2,c1)) ENGINE = MEMORY;
INSERT INTO t1(c1,c2) VALUES (5,1), (4,1), (3,5), (2,3), (1,3);
EXPLAIN SELECT c2, COUNT(c1) FROM t1 GROUP BY c2;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index c2 c2 8 NULL 5 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`c2` AS `c2`,count(`test`.`t1`.`c1`) AS `COUNT(c1)` from `test`.`t1` group by `test`.`t1`.`c2`
SELECT c2, COUNT(c1) FROM t1 GROUP BY c2;
c2 COUNT(c1)
1 2
3 2
5 1
DROP TABLE t1;
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