<MySQL的日期函數
定義和用法
的EXTRACT()函數是用於返回的日期/時間的單個部件,如年,月,日,時,分,等
Syntax
EXTRACT(unit FROM date)
凡日期是有效的日期表達式和單位可以是以下之一:
Unit Value |
---|
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 |
例
假設我們有以下的"Orders"表:
OrderId | ProductName | OrderDate |
---|---|---|
1 | Jarlsberg Cheese | 2014-11-22 13:23:44.657 |
下面的SELECT語句:
SELECT EXTRACT(YEAR FROM OrderDate) AS OrderYear,
EXTRACT(MONTH FROM OrderDate) AS OrderMonth,
EXTRACT(DAY FROM OrderDate) AS OrderDay
FROM Orders
WHERE OrderId=1
會導致這樣的:
OrderYear | OrderMonth | OrderDay |
---|---|---|
2014 | 11 | 22 |
<MySQL的日期函數