时间:2021-07-01 10:21:17 帮助过:61人阅读
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)