探讨如何计算age的sql函数

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我是靠谱客的博主背后宝贝，最近开发中收集的这篇文章主要介绍探讨如何计算age的sql函数，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

ALTER FUNCTION [dbo].[get_FullAge]
( 
 @birthday datetime, @currentDay datetime
)
RETURNS INT
AS
BEGIN
DECLARE @age INT
SET @age = DATEDIFF(YEAR, @birthday, @currentDay)
IF DATEDIFF(DAY, DATEADD(YEAR, @age, @birthday), @currentDay) <= 0
 SET @age = @age - 1
IF DATEPART(MONTH, @birthday) = 2 AND DATEPART(DAY, @birthday) = 29 AND DATEPART(MONTH, @currentDay) = 3
 AND DATEPART(DAY, @currentDay) = 1 AND 
 NOT (YEAR(@currentDay) % 4 = 0 AND (YEAR(@currentDay) % 100 !=0 OR YEAR(@currentDay) % 400 = 0))
 SET @age = @age - 1
IF @age < 0
 SET @age = 0
  RETURN @age
END

--Sql根据出生日期计算age（不是很准确）
1. select datediff(year,EMP_BIRTHDAY,getdate()) as '年龄' from EMPLOYEEUnChangeInfo
2. floor((DateDiff(day,u.EMP_BIRTHDAY,getdate()))/365