mariadb/mysql-test/r/explain.result

drop table if exists t1;
create table t1 (id int not null, str char(10), unique(str));
explain select * from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	const row not found
insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
select * from t1 where str is null;
id	str
1	NULL
2	NULL
select * from t1 where str="foo";
id	str
3	foo
explain select * from t1 where str is null;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	str	str	11	const	1	Using where
explain select * from t1 where str="foo";
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	str	str	11	const	1	
explain select * from t1 ignore key (str) where str="foo";
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
explain select * from t1 use key (str,str) where str="foo";
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	str	str	11	const	1	
explain select * from t1 use key (str,str,foo) where str="foo";
ERROR 42000: Key column 'foo' doesn't exist in table
explain select * from t1 ignore key (str,str,foo) where str="foo";
ERROR 42000: Key column 'foo' doesn't exist in table
drop table t1;
explain select 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
create table t1 (a int not null);
explain select count(*) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
insert into t1 values(1);
explain select count(*) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
insert into t1 values(1);
explain select count(*) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
drop table t1;
set names koi8r;
create table <20><><EFBFBD> (<28><><EFBFBD>0 int, <20><><EFBFBD>1 int, key <20><><EFBFBD>0 (<28><><EFBFBD>0), key <20><><EFBFBD>01 (<28><><EFBFBD>0,<2C><><EFBFBD>1));
insert into <20><><EFBFBD> (<28><><EFBFBD>0) values (1);
insert into <20><><EFBFBD> (<28><><EFBFBD>0) values (2);
explain select <20><><EFBFBD>0 from <20><><EFBFBD> where <20><><EFBFBD>0=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	<09><><EFBFBD>	ref	<09><><EFBFBD>0,<2C><><EFBFBD>01	<09><><EFBFBD>0	5	const	1	Using where; Using index
drop table <20><><EFBFBD>;
set names latin1;