在SQL server查询中将NULL替换为0

我已经开发了一个查询，在前三列的结果中，我得到NULL。我怎么把它换成0呢?

Select c.rundate, 
  sum(case when c.runstatus = 'Succeeded' then 1 end) as Succeeded, 
  sum(case when c.runstatus = 'Failed' then 1 end) as Failed, 
  sum(case when c.runstatus = 'Cancelled' then 1 end) as Cancelled, 
  count(*) as Totalrun from
  (    Select a.name,case when b.run_status=0 Then 'Failed' when b.run_status=1 Then 'Succeeded'
  when b.run_status=2 Then 'Retry' Else 'Cancelled' End as Runstatus,
  ---cast(run_date as datetime)
              cast(substring(convert(varchar(8),run_date),1,4)+'/'+substring(convert(varchar(8),run_date),5,2)+'/'          +substring(convert(varchar(8),run_date),7,2) as Datetime) as RunDate
  from msdb.dbo.sysjobs as a(nolock) inner join msdb.dbo.sysjobhistory as b(nolock) 
  on a.job_id=b.job_id
  where a.name='AI'
  and b.step_id=0) as c
  group by 
  c.rundate

当前回答

sum(case when c.runstatus = 'Succeeded' then 1 else 0 end) as Succeeded, 
sum(case when c.runstatus = 'Failed' then 1 else 0 end) as Failed, 
sum(case when c.runstatus = 'Cancelled' then 1 else 0 end) as Cancelled,

这里的问题是，如果没有else语句，当运行状态不是列描述中声明的状态时，您一定会收到一个Null。将任何东西添加到Null都会导致Null，这就是这个查询的问题。

好运！

2016-09-23 14:08:41

其他回答

sum(case when c.runstatus = 'Succeeded' then 1 else 0 end) as Succeeded, 
sum(case when c.runstatus = 'Failed' then 1 else 0 end) as Failed, 
sum(case when c.runstatus = 'Cancelled' then 1 else 0 end) as Cancelled,

好运！

2016-09-23 14:08:41

UPDATE TableName SET ColumnName= ISNULL(ColumnName, 0 ) WHERE Id = 10

2020-11-27 11:20:39

通过遵循之前的答案，我在SQL server db中丢失了我的列名，但是遵循这种语法帮助我保留了ColumnName

ISNULL(MyColumnName, 0) MyColumnName

2019-04-06 13:22:42

你说的前三列，是指求和列吗?如果是，将ELSE 0添加到CASE语句中。NULL值的SUM为NULL。

sum(case when c.runstatus = 'Succeeded' then 1 else 0 end) as Succeeded, 
sum(case when c.runstatus = 'Failed' then 1 else 0 end) as Failed, 
sum(case when c.runstatus = 'Cancelled' then 1 else 0 end) as Cancelled,

SQL小提琴演示

2013-05-30 15:49:44

一个简单的方法是

UPDATE tbl_name SET fild_name = value WHERE fild_name IS NULL

2016-07-02 09:26:24

在SQL server查询中将NULL替换为0

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