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mysql> select * from a;
+------+---------------------+
| id | date |
+------+---------------------+
| 1 | 2009-10-10 11:11:11 |
| 2 | 2009-10-10 11:11:13 |
| 3 | 2009-10-10 11:11:15 |
| 4 | 2009-10-10 11:11:17 |
+------+---------------------+
4 rows in set (0.08 sec)
mysql>
explain SQL语句