基于SQL中SET与SELECT赋值的区别详解eF4AIChat_企业网址导航_网址分类目录_企业黄页网址提交查询专业网站！

eF4AIChat_企业网址导航_网址分类目录_企业黄页网址提交查询专业网站！

复制具体相关代码 具体相关代码如下:     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