Sql 我只需要使用CAST返回月/日的帮助

通过“AS”不断获取错误。

使用

Month

和

Day

函数从日期类型中提取

Month

和

Day

。试试这个

SELECT DateAdded,
    CAST(DateAdded AS date USING 'mm:dd') AS MonthDay
FROM Products;

或者使用

convert

中的

101

样式，并将

/

替换为

：

SELECT DateAdded,      
       Convert(varchar(2),month(DateAdded))+':'+
                Convert(varchar(2),Day(DateAdded)) As MonthDay
FROM Products;

或

Datepart

SELECT DateAdded,      
       Replace(Left(Convert(varchar(20),DateAdded,101),4),'/',':') As MonthDay
FROM Products;

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下面是一个使用cast的可能解决方案

SELECT DateAdded,      
       Convert(varchar(2),Datepart(Month,DateAdded))+':'+
                Convert(varchar(2),Datepart(Day,DateAdded)) As MonthDay
FROM Products;

---

您正在使用的数据库您不能使用“USING”，我想您正在寻找一种方法，如date_format Select date_format（DateAdded，“%m:%d”）AS MonthDay选择DateAdded，CAST（DateAdded AS date）AS date，CAST（DateAdded AS time）AS time，CAST（DateAdded AS date USING'mm:dd'）AS MonthDate FROM Products；但是我得到了这个错误：Msg 156，级别15，状态10，第4行关键字“AS”附近的语法不正确。是的，我们想知道的是您使用的是哪种风格的SQL？MySQL、postgreSQL、hsqldb、Oracle？

SELECT 
    DateAdded, 
    CAST(DateAdded AS date) AS Date, 
    CAST(DateAdded AS time) AS Time, 
    right('0' + cast(month(DateAdded) as varchar(2)),2) + ':' 
        + right('0' + cast(day(DateAdded) as varchar(2)),2) AS MonthDay 
FROM Products