为什么SQL Server中的CTE在不满足任何条件的情况下执行内部联接?
我有一个表mse,它的所有行StatusId=1。但在像这样的查询中,无论列StatusId的值是多少,都会执行内部联接视图。如何预防为什么SQL Server中的CTE在不满足任何条件的情况下执行内部联接?,sql,sql-server-2005,common-table-expression,Sql,Sql Server 2005,Common Table Expression,我有一个表mse,它的所有行StatusId=1。但在像这样的查询中,无论列StatusId的值是多少,都会执行内部联接视图。如何预防 WITH cte201401291517 AS ( SELECT 'QuantityOutPerShift' = SUM([vsqo].[QuantityOutPerShift]) , [mse].[ShiftGroup] , [mse].[Station] , [vsqo].[Shift] FRO
WITH cte201401291517 AS
(
SELECT
'QuantityOutPerShift' = SUM([vsqo].[QuantityOutPerShift])
, [mse].[ShiftGroup]
, [mse].[Station]
, [vsqo].[Shift]
FROM
[dbo].[mse] AS mse
INNER JOIN
[dbo].[vmsqo] AS vsqo ON [mse].[Station] = [vsqo].[FromStation]
AND ( [mse].[ShiftGroup] = [vsqo].[ShiftGroup]
OR [mse].[ShiftGroup] = 'ALL') -- order is important!
WHERE
[mse].[StatusId] = 3
GROUP BY
[mse].[ShiftGroup]
, [mse].[Station]
, [vsqo].[Shift])
UPDATE
[dbo].[mse]
SET
[dbo].[mse].[QuantityOutPerShift] = [cte].[QuantityOutPerShift]
, [dbo].[mse].[ShiftCurrent] = [cte].[Shift]
--OUTPUT INSERTED.*
FROM
cte201401291517 AS cte
WHERE
[dbo].[mse].[Station] = [cte].[Station]
AND ( [dbo].[mse].[ShiftGroup] = [cte].[ShiftGroup]
OR [dbo].[mse].[ShiftGroup] = 'ALL' ) -- order is important!
AND [dbo].[mse].[StatusId] = 3;
若并没有CTE,我无法做到这一点,因为我正在用UPDATE语句中无法使用的SUM更新表
我正在使用SQLServer2005