mysql中in or优化
mysql> show profiles;+----------+------------+------------------------------------------------------
----+
| Query_ID | Duration | Query
|
+----------+------------+------------------------------------------------------
----+
| 1 | 0.00043675 | select> |
| 2 | 0.08359450 | select> 0 |
| 3 | 0.00052300 | select> |
| 4 | 0.02453225 | select> =21 |
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