mysql给日期创建索引_如何在MySql的DATETIME字段的日期部分创建索引

如何在DATETIME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用于保存交易发生的日期和时间

我的表中有超过1,000,000条记录，并且该语句

SELECT * FROM transactionlist where date(TranDateTime) = '2008-08-17'

花费很长时间。

编辑：