MySQL

Development Platform:

Visual C++

explain.result：Code Content

							id	str
1	NULL
2	NULL
id	str
3	foo
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ref	str	str	11	const	1	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	const	str	str	11	const	1	
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	ALL	str	NULL	NULL	NULL	4	where used
table	type	possible_keys	key	key_len	ref	rows	Extra
t1	const	str	str	11	const	1	
Comment
No tables used

						