Question

这是我尝试的代码

SELECT 
 case when InsertedRows is null then 0 else InsertedRows end InsertedRows
,case when FailedRows is null then 0 else FailedRows end FailedRows
,case when UpdatedRows is null then 0 else UpdatedRows end UpdatedRows
,InsertedRows + UpdatedRows + FailedRows as tot
FROM PATS.ImportLog
WHERE CreatedBy='suvaneeth' 
      AND ISNULL(CompletedYN,0) = 0 
      AND CAST(CreatedDate AS date) >= CAST(GETDATE() AS date)

我得到tot的结果为NULL

99  0   0   NULL

我希望结果是99

Answer 1

select 
case when InsertedRows is null then 0 else InsertedRows end InsertedRows
,case when FailedRows is null then 0 else FailedRows end FailedRows
,case when UpdatedRows is null then 0 else UpdatedRows end UpdatedRows
,COALESCE(InsertedRows,0) + COALESCE(UpdatedRows,0) + COALESCE(FailedRows,0) as tot
from PATS.ImportLog
WHERE CreatedBy='suvaneeth' AND ISNULL(CompletedYN,0)=0 AND CAST(CreatedDate AS date)>=CAST(GETDATE() AS date)

Answer 2

您可以尝试使用ISNULL(insertedrows, 0)或COALESCE(insertedrows, 0)代替CASE

Answer 3

以这种方式尝试。

select 
  Coalesce(InsertedRows, 0) InsertedRows
  ,Coalesce(FailedRows, 0) FailedRows
  ,Coalesce(UpdatedRows, 0) UpdatedRows
  ,Coalesce(InsertedRows, 0) + Coalesce(FailedRows, 0)+ Coalesce(UpdatedRows, 0) as tot
from PATS.ImportLog
WHERE CreatedBy='suvaneeth' AND ISNULL(CompletedYN,0)=0 AND CAST(CreatedDate AS date)>=CAST(GETDATE() AS date)

Answer 4

表达式：

SELECT ..., InsertedRows + UpdatedRows + FailedRows

引用FROM子句中的列，而不引用SELECT子句中的列名。您需要重复CASE语句，或者更好的方法是使用COALESCE，它比您使用的case语句短：

SELECT COALESCE(InsertedRows, 0) InsertedRows
     , COALESCE(FailedRows,   0) FailedRows
     , COALESCE(UpdatedRows,  0) UpdatedRows
     , COALESCE(InsertedRows, 0) + COALESCE(UpdatedRows, 0) + COALESCE(FailedRows, 0) AS tot
FROM PATS.ImportLog
WHERE CreatedBy = 'suvaneeth'

添加三个Integer变量将结果显示为Null，为什么呢？

4 个答案: