> Sql中文手册 > EXTRACT()

定义和用法

EXTRACT() 函数用于返回日期/时间的单独部分,比如年、月、日、小时、分钟等等。

语法

EXTRACT(unit FROM date)

date 参数是合法的日期表达式。unit 参数可以是下列的值:

Unit 值
MICROSECOND
SECOND
MINUTE
HOUR
DAY
WEEK
MONTH
QUARTER
YEAR
SECOND_MICROSECOND
MINUTE_MICROSECOND
MINUTE_SECOND
HOUR_MICROSECOND
HOUR_SECOND
HOUR_MINUTE
DAY_MICROSECOND
DAY_SECOND
DAY_MINUTE
DAY_HOUR
YEAR_MONTH

实例

假设我们有如下的 "Orders" 表:

OrderId ProductName OrderDate
1 Jarlsberg Cheese 2008-11-11 13:23:44.657

下面是 SELECT 语句:

SELECT EXTRACT(YEAR FROM OrderDate) AS OrderYear,
EXTRACT(MONTH FROM OrderDate) AS OrderMonth,
EXTRACT(DAY FROM OrderDate) AS OrderDay,
FROM Orders
WHERE OrderId=1

结果如下所示:

OrderYear OrderMonth OrderDay
2008 11 11
上一篇:
下一篇: