查询

今天

select * from 表名 where to_days(时间字段名) = to_days(now());

昨天

SELECT * FROM 表名 WHERE TO_DAYS( NOW( ) ) - TO_DAYS( 时间字段名) <= 1

7天

SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名)

近30天

SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(时间字段名)

本月

SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )

上一月

SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , '%Y%m' ) , date_format( 时间字段名, '%Y%m' ) ) =1

例子1：

mysql> select time('2013-05-13 19:50:33');+-----------------------------+

| time('2013-05-13 19:50:33') |

+-----------------------------+

| 19:50:33 |

+-----------------------------+

1 row in set (0.05sec)

mysql> select date('2013-05-13 19:50:33');+-----------------------------+

| date('2013-05-13 19:50:33') |

+-----------------------------+

| 2013-05-13 |

+-----------------------------+

1 row in set (0.00 sec)

例子2：

mysql> selectto_days(now());+----------------+

| to_days(now()) |

+----------------+

| 735425 |

+----------------+

1 row in set (0.03sec)

mysql> select to_days('2013-07-07 19:30:30');+--------------------------------+

| to_days('2013-07-07 19:30:30') |

+--------------------------------+

| 735421 |

+--------------------------------+

1 row in set (0.00sec)

mysql>