mssql sqlserver 将字段null(空值)值替换为指定值的三种方法分享

Posted 2020-12-25 Adeal(mssql_QQ群:314974645)

转自:http://www.maomao365.com/?p=6965  

摘要:
下文将分享两种将字段中null值替换为指定值的方法分享，如下所示:
实验环境:sqlserver 2008 R2

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例: 

create table test(keyId int identity, info varchar(30))
go
insert into test(info)values(‘a‘),(‘b‘),(null),(‘d‘)
go 
---方法1:使用isnull替换
select keyId,isnull(info,‘替换null值‘) as info from test 
go 
---方法2:使用case when 替换
select keyId,case when info is null then ‘替换null值‘ else info end as info from test 
---方法3:使用coalesce替换相应的值
select keyId , coalesce(info,‘替换null值‘) as info from test 

go 
truncate table test 
drop table test