在Sql列标头中使用函数

Question

我想知道是否可以使用计算函数作为列标头。请参阅下面我的代码。我想用昨天的日期作为和大小写列标题。

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

我强烈建议在应用程序层中进行这种重命名。

但是如果你仍然坚持你可以使用Dynamic-SQL:

LiveDemo

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;

另一个可能性是使用sp_rename函数:

LiveDemo2

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;