如何在日期时间字段的日期部分创建索引?
mysql> SHOW COLUMNS FROM transactionlist;
+-------------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+------------------+------+-----+---------+----------------+
| TransactionNumber | int(10) unsigned | NO | PRI | NULL | auto_increment |
| WagerId | int(11) | YES | MUL | 0 | |
| TranNum | int(11) | YES | MUL | 0 | |
| TranDateTime | datetime | NO | | NULL | |
| Amount | double | YES | | 0 | |
| Action | smallint(6) | YES | | 0 | |
| Uid | int(11) | YES | | 1 | |
| AuthId | int(11) | YES | | 1 | |
+-------------------+------------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)
TranDateTime用于在发生事务时保存事务的日期和时间
我的表中有超过1,000,000条记录,语句
SELECT * FROM transactionlist where date(TranDateTime) = '2008-08-17'
需要很长时间。
编辑:
看看这篇关于"Why MySQL’s DATETIME can and should be avoided“的博文。
https://stackoverflow.com/questions/95183
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