从sqlserver数据库中提取日期，并把年月日分别截取出来

可以用substring截取，也可以转换成datetime然后用year、month、day三个函数计算

以标准日期格式2012-12-19

10:50:02000为例

substring(col,1,4)=year

substring(col,6,2)=month

substring(col,9,2)=day

year(convert(datetime,col))、month(convert(datetime,col))、day(convert(datetime,col))

WHERE

Year( 订购日期 ) = 2004 AND MONTH ( 订购日期 ) = 5;

就可以了。

注： MySQL 中， 获取 日期的组成部分， 有2套函数可以使用， 下面是执行的例子代码：

mysql> SELECT 'NOW' DisplayMode, NOW() B

-> UNION ALL

-> SELECT 'Second' DisplayMode, Second(NOW()) B

-> UNION ALL

-> SELECT 'Minute' DisplayMode, MINUTE(NOW()) B

-> UNION ALL

-> SELECT 'Hour' DisplayMode, Hour(NOW()) B

-> UNION ALL

-> SELECT 'Day' DisplayMode, DAY(NOW()) B

-> UNION ALL

-> SELECT 'Week' DisplayMode, Week(NOW()) B

-> UNION ALL

-> SELECT 'Month' DisplayMode, Month(NOW()) B

-> UNION ALL

-> SELECT 'Year' DisplayMode, Year(NOW()) B;

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

| DisplayMode | B |

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

| NOW | 2013-04-07 09:29:54 |

| Second | 54 |

| Minute | 29 |

| Hour | 9 |

| Day | 7 |

| Week | 14 |

| Month | 4 |

| Year | 2013 |

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

8 rows in set (000 sec)

mysql> SELECT '年' AS name, EXTRACT(YEAR FROM NOW()) AS value

-> UNION ALL

-> SELECT '年月' AS name, EXTRACT(YEAR_MONTH FROM NOW()) AS value

-> UNION ALL

-> SELECT '月' AS name, EXTRACT(MONTH FROM NOW()) AS value

-> UNION ALL

-> SELECT '日' AS name, EXTRACT(DAY FROM NOW()) AS value

-> UNION ALL

-> SELECT '时' AS name, EXTRACT(HOUR FROM NOW()) AS value

-> UNION ALL

-> SELECT '分' AS name, EXTRACT(MINUTE FROM NOW()) AS value

-> UNION ALL

-> SELECT '秒' AS name, EXTRACT(SECOND FROM NOW()) AS value;

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

| name | value |

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

| 年 | 2013 |

| 年月 | 201304 |

| 月 | 4 |

| 日 | 7 |

| 时 | 9 |

| 分 | 27 |

| 秒 | 43 |

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

7 rows in set (000 sec)

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