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                            ### MySQL EXTRACT() 函數
* * * * *
#### 定義和用法
EXTRACT() 函數用于返回日期/時間的單獨部分，比如年、月、日、小時、分鐘等等。
#### 語法
~~~
EXTRACT(unit FROM date)
~~~
#### 實例
假設我們有如下的表：
|OrderId	|ProductName	|OrderDate|
|-|-|-|
|1	|'Computer'	|2008-12-29 16:25:46.635|

我們使用下面的 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
~~~
結果：
|OrderYear	|OrderMonth	|OrderDay|
|-|-|-|
|2008	|12	|29|
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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