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SQLSERVER2012新增函数之逻辑函数IIF

数据库操作教程 2022-09-23 18:11:43 转载来源: 网络整理/侵权必删

前言SQLSERVER2012中新增了IIF函数,这个函数在VB或是ACCESS中是存在的。感兴趣的朋友们下面来一起学习学习吧

前言

SQL SERVER 2012中新增IIF函数,这个函数在VB或是ACCESS中是存在的。感兴趣的朋友们下面来一起学习学习吧。

格式如下

iif(布尔表达式,value1,value2)

也就是说如果表达式成立,那么就返回value1,如果不成立,就返回value2.

示例如下

例如:

select iif(30>45,'对','错') as 结果 /* 结果 ---- 错 */ select iif(null=null,'对','错') as 结果 /* 结果 ---- 错 */ select iif(null is null,'对','错') as 结果 /* 结果 ---- 对 */ 

这让我想起SQLSERVER之前有个函数叫NULLIF,如果两个指定的表达式相等,则返回空值。

declare @i int set @i=null select NULLIF(@i,null) /* NULL */ 

NULLIF上面返回NULL,并不说明两者相等,而是两者不相等时,返回前者,而前者的@i恰巧为NULL造成的。

总结

以上就是关于SQL SERVER 2012新增函数之逻辑函数IIF的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对脚本之家的支持。

标签: 函数 SQLSERVER2012 新增 逻辑 IIF


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