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

Posted 2021-01-19 Adeal(mssql_QQ群:314974645)

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 

转自:http://www.maomao365.com/?p=6965