mysql时间函数之year,quarter,month,week用法

转载自： https://blog.csdn.net/csdn_0_001/article/details/79502200

语法

YEAR(date)

Returns the year for date, in the range 1000 to 9999, or 0 for the “zero” date.

返回日期的年份，范围为1000到9999，或者对于“零”日期返回0。

QUARTER(date)

Returns the quarter of the year for date, in the range 1 to 4.

返回日期的一年中的季度，范围为1到4。

MONTH(date)

Returns the month for date, in the range 1 to 12 for January to December, or 0 for dates such as ‘0000-00-00’ or ‘2008-00-00’ that have a zero month part.

返回日期的月份，1月至12月的范围为1至12，对于包含月份为零的日期（如“0000-00-00”或“2008-00-00”），返回0。

WEEK(date[,mode])

This function returns the week number for date. The two-argument form of WEEK() enables you to specify whether the week starts on Sunday or Monday and whether the return value should be in the range from 0 to 53 or from 1 to 53. If the mode argument is omitted, the value of the default_week_format system variable is used.

此函数返回日期的周号。 WEEK（）的双参数使您能够指定星期是从星期天还是星期一开始，以及返回值是在0到53还是从1到53的范围内。如果省略mode参数，则值 使用了default_week_format系统变量。

实例

SELECT YEAR('2011-12-13');      # 2011

SELECT QUARTER('2011-12-13');   # 4

SELECT MONTH('2011-12-13');     # 12

SELECT WEEK('2011-12-31');      # 52
SELECT WEEK('2004-12-31',0);    # 52
SELECT WEEK('2004-12-31',1);    # 53
SELECT WEEK('2004-01-01',0);    # 0
SELECT WEEK('2004-01-01',1);    # 1