如何在SQL中替换PIVOT中的空值

Question

我有以下代码，我试图替换使用零轴时出现的Null。 我执行以下操作，但它说“ISNULL'附近的语法不正确。” 我不确定我做错了什么？ 请给我任何建议

select *
from #tempfinaltable
pivot ISNULL(sum(TotalXSAAL),0) for Section_desc in
([Communication],[Construction],[Energy],[Financial Institutions],
 [General Property],[HIGHER ED & HEALTHCARE],
 [Inland Marine],[Real Estate])) AS AALs

我正在使用的dyanmic SQL。 上面的查询只显示名称，以便您可以看到我正在使用的内容

 select *
from #tempfinaltable
pivot (sum(TotalXSAAL) for Section_desc in
' + '('+@BranchNames++')) AS AALs'

你能告诉我这句话有什么不对吗？ 我有语法问题：

BEGIN 

    Set @ISNullBranchNames = @ISNullBranchNames + 'ISNULL('+(@BranchNames+',0),' 
    Set @BranchNames = @BranchNames + '['+@BranchName+'],'

    FETCH NEXT FROM CUR1 INTO @BranchName

END

Answer 1

所有PIVOT子句必须在括号中。

结果查询必须如下所示：

SELECT 
      'TotalXSAAL' as Col,
      ISNULL([Communication], 0) AS [Communication],
      ISNULL([Construction], 0) AS [Construction],
      ...,
      ...,
      ... 
FROM #tempfinaltable
PIVOT
(
  SUM(TotalXSAAL) for
  Section_desc in
  (
    [Communication],[Construction],[Energy],[Financial Institutions],
    [General Property],[HIGHER ED & HEALTHCARE],
    [Inland Marine],[Real Estate]
  )
)AS AALs

SQL FIDDLE DEMO

UPDATE

如何生成动态SQL的部分。

DECLARE @ISNullBranchNames nvarchar(MAX) = N'' -- you mast add empty string first, otherwise you will get NULL inresult
DECLARE @BranchNames nvarchar(MAX) = N''
.....
BEGIN 

    Set @ISNullBranchNames =
             @ISNullBranchNames + 'ISNULL([' + @BranchName + '], 0) AS [' + @BranchName +'], '
    Set @BranchNames = @BranchNames + '['+@BranchName+'],'

    FETCH NEXT FROM CUR1 INTO @BranchName

END

Answer 2

如果要用空字符串替换PIVOT TABLE中的NULL ，那么

ISNULL ( CAST (SUM(UnitPrice]) as NVARCHAR),'') 

这将UnitPrice的SUM值转换为VARCHAR，然后使用ISNULL将其替换为空字符串