日期:2014-05-17 浏览次数:20501 次
mysql> explain select * from emp where ename="dsleos" or ename="saesad" \G
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: emp
type: range
possible_keys: e_i
key: e_i
key_len: 62
ref: NULL
rows: 2
Extra: Using where
1 row in set (0.00 sec)