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1
by brian
clean slate |
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drop table if exists t1;
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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;
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a=1 or a=0;
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_Comment
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t1 0 PRIMARY 1 a A NULL NULL NULL BTREE
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select * from t1;
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a b
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2 2
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3 3
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4 4
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select * from t1 where a=4;
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a b
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4 4
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update t1 set b=5 where a=4;
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update t1 set b=b+1 where a>=3;
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replace t1 values (3,3);
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select * from t1;
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a b
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2 2
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3 3
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4 6
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alter table t1 add c int not null, add key using BTREE (c,a);
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drop table t1;
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create table t1 (a int not null,b int not null, primary key using BTREE (a)) engine=heap comment="testing heaps";
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insert into t1 values(-2,-2),(-1,-1),(0,0),(1,1),(2,2),(3,3),(4,4);
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delete from t1 where a > -3;
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select * from t1;
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30 |
a b
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31 |
drop table t1;
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create table t1 (a int not null,b int not null, primary key using BTREE (a)) engine=heap comment="testing heaps";
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insert into t1 values(1,1),(2,2),(3,3),(4,4);
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alter table t1 modify a int not null auto_increment, engine=myisam, comment="new myisam table";
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select * from t1;
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a b
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1 1
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2 2
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3 3
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4 4
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41 |
drop table t1;
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create table t1 (a int not null) engine=heap;
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insert into t1 values (869751),(736494),(226312),(802616),(728912);
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select * from t1 where a > 736494;
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a
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869751
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802616
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alter table t1 add unique uniq_id using BTREE (a);
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select * from t1 where a > 736494;
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a
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802616
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869751
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select * from t1 where a = 736494;
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a
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736494
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56 |
select * from t1 where a=869751 or a=736494;
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a
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736494
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869751
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select * from t1 where a in (869751,736494,226312,802616);
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a
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226312
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736494
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802616
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869751
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alter table t1 engine=myisam;
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explain select * from t1 where a in (869751,736494,226312,802616);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 Using where; Using index
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drop table t1;
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create table t1 (x int not null, y int not null, key x using BTREE (x,y), unique y using BTREE (y))
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engine=heap;
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insert into t1 values (1,1),(2,2),(1,3),(2,4),(2,5),(2,6);
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explain select * from t1 where x=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref x x 4 const 1
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select * from t1 where x=1;
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x y
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1 1
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1 3
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select * from t1,t1 as t2 where t1.x=t2.y;
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x y x y
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1 1 1 1
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2 2 2 2
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1 3 1 1
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2 4 2 2
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2 5 2 2
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2 6 2 2
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explain select * from t1,t1 as t2 where t1.x=t2.y;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL x NULL NULL NULL 6
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1 SIMPLE t2 eq_ref y y 4 test.t1.x 1
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drop table t1;
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create table t1 (a int) engine=heap;
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insert into t1 values(1);
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select max(a) from t1;
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max(a)
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1
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drop table t1;
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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;
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insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
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select * from t1 where a=1;
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a b
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1 1
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1 2
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1 3
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1 4
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1 5
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1 6
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insert into t1 values(1,1),(1,2),(2,3),(1,3),(1,4),(1,5),(1,6);
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select * from t1 where a=1;
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a b
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1 1
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1 1
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1 2
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1 2
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1 3
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1 3
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1 4
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1 4
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1 5
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1 5
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1 6
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1 6
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explain select * from tx where a=x order by a,b;
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id select_type table type possible_keys key key_len ref rows Extra
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x SIMPLE tx ref a a x const x Using where
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explain select * from tx where a=x order by b;
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id select_type table type possible_keys key key_len ref rows Extra
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x SIMPLE tx ref a a x const x Using where
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select * from t1 where b=1;
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a b
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1 1
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1 1
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explain select * from tx where b=x;
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id select_type table type possible_keys key key_len ref rows Extra
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x SIMPLE tx ref b b x const x
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138 |
drop table t1;
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413.2.2
by Brian Aker
Removed UNSIGNED from parser. |
139 |
create table t1 (id int not null, primary key using BTREE (id)) engine=HEAP;
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1
by brian
clean slate |
140 |
insert into t1 values(1);
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141 |
select max(id) from t1;
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142 |
max(id)
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143 |
1
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insert into t1 values(2);
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select max(id) from t1;
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max(id)
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2
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replace into t1 values(1);
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149 |
drop table t1;
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150 |
create table t1 (n int) engine=heap;
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151 |
drop table t1;
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152 |
create table t1 (n int) engine=heap;
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153 |
drop table if exists t1;
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CREATE table t1(f1 int not null,f2 char(20) not
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null,index(f2)) engine=heap;
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INSERT into t1 set f1=12,f2="bill";
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INSERT into t1 set f1=13,f2="bill";
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INSERT into t1 set f1=14,f2="bill";
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INSERT into t1 set f1=15,f2="bill";
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INSERT into t1 set f1=16,f2="ted";
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161 |
INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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INSERT into t1 set f1=12,f2="ted";
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164 |
INSERT into t1 set f1=12,f2="ted";
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delete from t1 where f2="bill";
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select * from t1;
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f1 f2
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16 ted
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12 ted
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12 ted
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12 ted
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12 ted
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drop table t1;
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create table t1 (btn char(10) not null, key using BTREE (btn)) engine=heap;
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insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
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explain select * from t1 where btn like "i%";
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id select_type table type possible_keys key key_len ref rows Extra
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383.1.16
by Brian Aker
Force client communication into UTF8 |
178 |
1 SIMPLE t1 range btn btn 42 NULL 1 Using where
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1
by brian
clean slate |
179 |
explain select * from t1 where btn like "h%";
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180 |
id select_type table type possible_keys key key_len ref rows Extra
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383.1.16
by Brian Aker
Force client communication into UTF8 |
181 |
1 SIMPLE t1 range btn btn 42 NULL # Using where
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1
by brian
clean slate |
182 |
explain select * from t1 where btn like "a%";
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183 |
id select_type table type possible_keys key key_len ref rows Extra
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383.1.16
by Brian Aker
Force client communication into UTF8 |
184 |
1 SIMPLE t1 range btn btn 42 NULL 1 Using where
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1
by brian
clean slate |
185 |
explain select * from t1 where btn like "b%";
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186 |
id select_type table type possible_keys key key_len ref rows Extra
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383.1.16
by Brian Aker
Force client communication into UTF8 |
187 |
1 SIMPLE t1 range btn btn 42 NULL 1 Using where
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1
by brian
clean slate |
188 |
select * from t1 where btn like "ff%";
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btn
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select * from t1 where btn like " %";
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191 |
btn
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select * from t1 where btn like "q%";
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193 |
btn
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194 |
alter table t1 add column new_col char(1) not null, add key using BTREE (btn,new_col), drop key btn;
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update t1 set new_col=left(btn,1);
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196 |
explain select * from t1 where btn="a";
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197 |
id select_type table type possible_keys key key_len ref rows Extra
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383.1.16
by Brian Aker
Force client communication into UTF8 |
198 |
1 SIMPLE t1 ref btn btn 42 const 1 Using where
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1
by brian
clean slate |
199 |
explain select * from t1 where btn="a" and new_col="a";
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200 |
id select_type table type possible_keys key key_len ref rows Extra
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383.1.16
by Brian Aker
Force client communication into UTF8 |
201 |
1 SIMPLE t1 ref btn btn 48 const,const 1 Using where
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1
by brian
clean slate |
202 |
drop table t1;
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203 |
CREATE TABLE t1 (
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a int default NULL,
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b int default NULL,
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206 |
KEY a using BTREE (a),
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UNIQUE b using BTREE (b)
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) engine=heap;
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209 |
INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
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210 |
SELECT * FROM t1 WHERE a=NULL;
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211 |
a b
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212 |
explain SELECT * FROM t1 WHERE a IS NULL;
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213 |
id select_type table type possible_keys key key_len ref rows Extra
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214 |
1 SIMPLE t1 ref a a 5 const 1 Using where
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SELECT * FROM t1 WHERE a<=>NULL;
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216 |
a b
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217 |
NULL 99
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218 |
SELECT * FROM t1 WHERE b=NULL;
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219 |
a b
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220 |
explain SELECT * FROM t1 WHERE b IS NULL;
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221 |
id select_type table type possible_keys key key_len ref rows Extra
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222 |
1 SIMPLE t1 ref b b 5 const 1 Using where
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223 |
SELECT * FROM t1 WHERE b<=>NULL;
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224 |
a b
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225 |
99 NULL
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226 |
INSERT INTO t1 VALUES (1,3);
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227 |
ERROR 23000: Duplicate entry '3' for key 'b'
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228 |
DROP TABLE t1;
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229 |
CREATE TABLE t1 (a int, b int, c int, key using BTREE (a, b, c)) engine=heap;
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230 |
INSERT INTO t1 VALUES (1, NULL, NULL), (1, 1, NULL), (1, NULL, 1);
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231 |
SELECT * FROM t1 WHERE a=1 and b IS NULL;
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232 |
a b c
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233 |
1 NULL NULL
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234 |
1 NULL 1
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235 |
SELECT * FROM t1 WHERE a=1 and c IS NULL;
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236 |
a b c
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237 |
1 NULL NULL
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238 |
1 1 NULL
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239 |
SELECT * FROM t1 WHERE a=1 and b IS NULL and c IS NULL;
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240 |
a b c
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241 |
1 NULL NULL
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242 |
DROP TABLE t1;
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243 |
CREATE TABLE t1 (a int not null, primary key using BTREE (a)) engine=heap;
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244 |
INSERT into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11);
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245 |
DELETE from t1 where a < 100;
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246 |
SELECT * from t1;
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247 |
a
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248 |
DROP TABLE t1;
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249 |
create table t1(a int not null, key using btree(a)) engine=heap;
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250 |
insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
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251 |
select a from t1 where a > 2 order by a;
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252 |
a
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253 |
3
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254 |
3
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255 |
3
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256 |
3
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257 |
delete from t1 where a < 4;
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258 |
select a from t1 order by a;
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259 |
a
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260 |
insert into t1 values (2), (2), (2), (1), (1), (3), (3), (3), (3);
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261 |
select a from t1 where a > 4 order by a;
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262 |
a
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263 |
delete from t1 where a > 4;
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264 |
select a from t1 order by a;
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265 |
a
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266 |
1
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267 |
1
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268 |
2
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269 |
2
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270 |
2
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271 |
3
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272 |
3
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273 |
3
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274 |
3
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275 |
select a from t1 where a > 3 order by a;
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276 |
a
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277 |
delete from t1 where a >= 2;
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278 |
select a from t1 order by a;
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279 |
a
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280 |
1
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281 |
1
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282 |
drop table t1;
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283 |
CREATE TABLE t1 (
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284 |
c1 CHAR(3),
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285 |
c2 INTEGER,
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286 |
KEY USING BTREE(c1),
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287 |
KEY USING BTREE(c2)
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288 |
) ENGINE= MEMORY;
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289 |
INSERT INTO t1 VALUES ('ABC',0), ('A',0), ('B',0), ('C',0);
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290 |
UPDATE t1 SET c2= c2 + 1 WHERE c1 = 'A';
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291 |
SELECT * FROM t1;
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292 |
c1 c2
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293 |
ABC 0
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294 |
A 1
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295 |
B 0
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296 |
C 0
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297 |
DROP TABLE t1;
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298 |
CREATE TABLE t1 (
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299 |
c1 ENUM('1', '2'),
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300 |
UNIQUE USING BTREE(c1)
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377.1.4
by Brian Aker
Big, fat, UTF-8 patch. This fixes some of the oddities around only one |
301 |
) ENGINE= MEMORY;
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1
by brian
clean slate |
302 |
INSERT INTO t1 VALUES('1'), ('2');
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303 |
DROP TABLE t1;
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304 |
CREATE TABLE t1 (a INT, KEY USING BTREE(a)) ENGINE=MEMORY;
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305 |
INSERT INTO t1 VALUES(1),(2),(2);
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306 |
DELETE FROM t1 WHERE a=2;
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307 |
SELECT * FROM t1;
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308 |
a
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309 |
1
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310 |
DROP TABLE t1;
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311 |
End of 4.1 tests
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312 |
CREATE TABLE t1(val INT, KEY USING BTREE(val)) ENGINE=memory;
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313 |
INSERT INTO t1 VALUES(0);
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314 |
SELECT INDEX_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='t1';
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315 |
INDEX_LENGTH
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316 |
21
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317 |
UPDATE t1 SET val=1;
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318 |
SELECT INDEX_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='t1';
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319 |
INDEX_LENGTH
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320 |
21
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321 |
DROP TABLE t1;
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322 |
CREATE TABLE t1 (a INT, UNIQUE USING BTREE(a)) ENGINE=MEMORY;
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323 |
INSERT INTO t1 VALUES(NULL),(NULL);
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324 |
DROP TABLE t1;
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325 |
create table t1(a varchar(255), b varchar(255),
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326 |
key using btree (a,b)) engine=memory;
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327 |
insert into t1 values (1, 1), (3, 3), (2, 2), (NULL, 1), (NULL, NULL), (0, 0);
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328 |
select * from t1 where a is null;
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329 |
a b
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330 |
NULL NULL
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331 |
NULL 1
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332 |
drop table t1;
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333 |
End of 5.0 tests
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