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警告：这是从我的系统产生的实际代码：很差（未完）联盟在SQL Server性能2005
;WITH RESULTS AS (
SELECT 1174 AS BatchRunID, 'STATINV' AS Program, m.APPL_CD, m.ALBASE, 'CountFocusRecords' AS Measure, COUNT(*) AS Value
FROM [MISWork].[SX_FOCUS_NATIVE_200806] AS m WITH(NOLOCK)
INNER JOIN MISProcess.SXProcessCatalog AS cat WITH(NOLOCK)
ON cat.APPL_CD = m.APPL_CD
AND cat.ALBASE = m.ALBASE
AND COALESCE(cat.ProcessName, 'STATINV') = 'STATINV'
GROUP BY m.APPL_CD, m.ALBASE
UNION
SELECT 1174 AS BatchRunID, 'STATINV' AS Program, c.APPL_CD, c.ALBASE, 'CountBiminiRecords' AS Measure, COUNT(*) AS Value
FROM [MISWork].[SX_STATINV] AS c WITH(NOLOCK)
INNER JOIN MISProcess.SXProcessCatalog AS cat WITH(NOLOCK)
ON cat.APPL_CD = c.APPL_CD
AND cat.ALBASE = c.ALBASE
AND COALESCE(cat.ProcessName, 'STATINV') = 'STATINV'
GROUP BY c.APPL_CD, c.ALBASE
UNION
SELECT 1174 AS BatchRunID, 'STATINV' AS Program, m.APPL_CD, m.ALBASE, 'RecordsInFocusMissingInBimini' AS Measure, COUNT(*) AS Value
FROM [MISWork].[SX_FOCUS_NATIVE_200806] AS m WITH(NOLOCK)
LEFT JOIN [MISWork].[SX_STATINV] AS c WITH(NOLOCK)
ON m.[YEAR] = c.[YEAR]
AND m.[MONTH] = c.[MONTH]
AND m.[BANK_NO] = c.[BANK_NO]
AND m.[COST_CENTER] = c.[COST_CENTER]
AND m.[GLACCOUNT_NO] = c.[GLACCOUNT_NO]
AND m.[CUSTACCOUNT] = c.[CUSTACCOUNT]
AND m.[APPL_CD] = c.[APPL_CD]
AND m.[ALBASE] = c.[ALBASE]
INNER JOIN MISProcess.SXProcessCatalog AS cat WITH(NOLOCK)
ON cat.APPL_CD = m.APPL_CD
AND cat.ALBASE = m.ALBASE
AND COALESCE(cat.ProcessName, 'STATINV') = 'STATINV'
WHERE c.[YEAR] IS NULL
GROUP BY m.APPL_CD, m.ALBASE
UNION
SELECT 1174 AS BatchRunID, 'STATINV' AS Program, c.APPL_CD, c.ALBASE, 'RecordsInBiminiMissingInFocus' AS Measure, COUNT(*) AS Value
FROM [MISWork].[SX_FOCUS_NATIVE_200806] AS m WITH(NOLOCK)
RIGHT JOIN [MISWork].[SX_STATINV] AS c WITH(NOLOCK)
ON m.[YEAR] = c.[YEAR]
AND m.[MONTH] = c.[MONTH]
AND m.[BANK_NO] = c.[BANK_NO]
AND m.[COST_CENTER] = c.[COST_CENTER]
AND m.[GLACCOUNT_NO] = c.[GLACCOUNT_NO]
AND m.[CUSTACCOUNT] = c.[CUSTACCOUNT]
AND m.[APPL_CD] = c.[APPL_CD]
AND m.[ALBASE] = c.[ALBASE]
INNER JOIN MISProcess.SXProcessCatalog AS cat WITH(NOLOCK)
ON cat.APPL_CD = c.APPL_CD
AND cat.ALBASE = c.ALBASE
AND COALESCE(cat.ProcessName, 'STATINV') = 'STATINV'
WHERE m.[YEAR] IS NULL
GROUP BY c.APPL_CD, c.ALBASE
) SELECT * FROM RESULTS ORDER BY Program, APPL_CD, ALBASE, Measure
的代码只是坐在那里，没有锁定或阻塞。
UNION的各个组件每个都会在几秒钟内返回。该代码通常用于检查STAT组中所有其他程序的输出结果，但只是暂停此代码。
删除CTE，没有效果，坐在那里30分钟/小时，无论长时间您在等待取消之前都等待。
删除UNION，并且4个结果集在11秒内返回，在所有4个结果集中共有19个记录。
只运行前两个 - 运行良好，只运行最后2个，也很好。前三个在一起，也很好。
我已经修改了代码，将这些输出到#temp表中，用于其他需求，所以我只是要将其更改为按顺序将每个输出到#temp表中，但我从未见过SQL就这样停下来，没有任何阻塞的迹象。
这些都没有任何效果。 RIGHT JOIN不应该与它有任何关系，对吧？我在代码gen过程中很懒惰，所以不是反转输出，而是做了RIGHT JOIN而不是LEFT JOIN。 – 2008-10-02 21:56:59
一般来说，没有 - 左连接和右连接可以互相拆分而没有问题。但是，这看起来像是一个查询优化器错误，所以影响查询计划的任何事情都可能成为触发器。如果您可以访问具有相同问题的测试数据库，请启动Profiler并查看。 – 2008-10-02 22:53:51