Question

SELECT * FROM hr.Employees; 

SELECT firstname,
       lastname,   
       (CASE WHEN (month(getdate()) > month(birthdate))             
             THEN datediff(yy,birthdate,getdate())              
             ELSE datediff(yy,birthdate,getdate()) -1
        END) AS _years,          --years         
       (CASE WHEN (month(getdate()) > month(birthdate))               
             THEN month(getdate()) - month(birthdate)               
             ELSE month(getdate()) - month(birthdate) +12            
        END) AS _months,     --months
       (CASE WHEN (day(getdate()) > (day(birthdate)))               
             THEN day(getdate()) - day(birthdate)                
             ELSE month(getdate()) - month(birthdate) +11  &   day(getdate()) + (day(EOMonth(birthdate)) - day(birthdate))        
        END) AS _days          --days
FROM hr.Employees

以下是以yy，mm，dd查找年龄的代码。我遇到的问题是在日期部分。

我想做的是(if current day < birthdate day )然后(currentMonth-birthmonht)+11 and day(getdate()) + (day(EOMonth(birthdate)) - day(birthdate))。

Answer 1

我想做的是（如果是当天＆lt; birthdate day）那么（currentMonth-birthmonht）+11和day（getdate（））+ （日（EOMonth（出生日期）） - 日（出生日期））。

这不能在CASE列的days中完成，您需要在WHEN中为CASE添加新的month条款列本身。如下面的代码

SELECT firstname,
       lastname,   
       (CASE WHEN (month(getdate()) > month(birthdate))  THEN datediff(yy,birthdate,getdate())              
             ELSE datediff(yy,birthdate,getdate()) -1
        END) AS years,                
       (CASE WHEN (month(getdate()) > month(birthdate))  THEN month(getdate()) - month(birthdate)
             WHEN (day(getdate()) > (day(birthdate))) THEN month(getdate()) - month(birthdate) +11 
             ELSE month(getdate()) - month(birthdate) +12  
        END) AS months,    
       (CASE WHEN (day(getdate()) > (day(birthdate)))    THEN day(getdate()) - day(birthdate)                
             ELSE day(getdate()) + (day(EOMonth(birthdate)) - day(birthdate))        
        END) AS days          
FROM Employees

以下是查询的SQL小提示演示：SQL Fiddle

如果你可以使用T-SQL this答案显示如何在T-SQL中执行此操作。

使用CASE子句查找年龄

1 个答案: