sql-server - 在 Sql 列标题中使用函数

Question

我想知道是否可以将计算函数用作列标题。请在下面查看我的代码。我想将昨天的日期用作总和案例列标题。

DECLARE @A AS VARCHAR(12)
SET @A = GETDATE()-1

select Data,  
    sum(case when DATEDIFF(DAY, Dt, GETDATE()) = 1and Type = 'Stock'
    then Spend end) AS  @A
from dbo.vw_ZZ_AS_ComplianceLeagueTable
group by Data

Answer 1

我强烈建议在应用层进行这种重命名。

但是如果你仍然坚持你可以使用 Dynamic-SQL：

现场演示

DECLARE @A AS VARCHAR(12)= GETDATE()-1;

DECLARE @sql NVARCHAR(MAX) = 
  N'SELECT [Data], 
      SUM(CASE WHEN DATEDIFF(DAY, Dt, GETDATE()) = 1 AND Type = ''Stock'' THEN SPEND END) AS <placeholder>
    FROM #vw_ZZ_AS_ComplianceLeagueTable
    GROUP BY [Data];';

SET @sql = REPLACE(@sql, '<placeholder>', QUOTENAME(@A));

EXEC [dbo].[sp_executesql]
       @sql;

另一种可能性是使用sp_rename函数：

现场演示2

DECLARE @A AS VARCHAR(12)= GETDATE()-1;

SELECT [Data], 
      SUM(CASE WHEN DATEDIFF(DAY, Dt, GETDATE()) = 1 AND Type = 'Stock' THEN SPEND END) AS [placeholder]
INTO #temp
FROM #vw_ZZ_AS_ComplianceLeagueTable
GROUP BY [Data];

 DECLARE @new_name NVARCHAR(128) = QUOTENAME(@A);

EXEC tempdb..sp_rename '#temp.placeholder', @new_name, 'COLUMN'; 

SELECT *
FROM #temp;