我正在处理查询。一切进展顺利，直到我碰到这个障碍，但我仍无法弄清楚问题出在哪里。
我不应该只能访问Report Builder 3.0中的查询生成器。在我的组织中，除非您是IT人员，否则您将无法访问SQL Server Management Studio。...不要让我入门。
这是查询：
SELECT
[SUM].[REFNO]
,[SUM].[CURR-APPLICATION]
,[SUM].[RN]
,[SUM].[Med_Process_Start]
,[SUM].[SENT]
,[SUM].[RCVD]
,[SUM].[MD-DS]
,[SUM].[MD-RA]
,[SUM].[MN-DS]
,[SUM].[MN-RA]
,(CASE
/* ---------------------------------------------------------------------- */
WHEN
[SUM].[MD-RA] IS NULL AND
[SUM].[MN-RA] IS NULL
THEN
CASE
WHEN
[SUM].[MD-DS] IS NULL AND
[SUM].[MN-DS] IS NULL
THEN
CASE
WHEN
[SUM].[SENT] IS NOT NULL AND
[SUM].[RCVD] IS NULL
THEN 'Issued'
WHEN
[SUM].[RCVD] IS NOT NULL
THEN 'Waiting for decision'
END
WHEN
[SUM].[MD-DS] IS NOT NULL AND
[SUM].[MN-DS] IS NULL
THEN
CASE
WHEN
[SUM].[RCVD] IS NULL
THEN '(e) Missing received Date'
WHEN
[SUM].[RCVD] IS NOT NULL AND
[SUM].[RCVD] <= [SUM].[MD-DS]
THEN 'Decision Medical'
WHEN
[SUM].[RCVD] IS NOT NULL AND
[SUM].[RCVD] > [SUM].[MD-DS]
THEN 'Waiting for NEW decision'
END
WHEN
[SUM].[MD-DS] IS NULL AND
[SUM].[MN-DS] IS NOT NULL
THEN
CASE
WHEN
[SUM].[RCVD] IS NULL
THEN '(e) Missing received Date'
WHEN
[SUM].[RCVD] IS NOT NULL
THEN
CASE
WHEN
[SUM].[RCVD] <= [SUM].[MN-DS]
THEN 'Decision Mental'
WHEN
[SUM].[RCVD] > [SUM].[MN-DS]
THEN 'Waiting for NEW decision'
END
END
WHEN
[SUM].[MD-DS] IS NOT NULL AND
[SUM].[MN-DS] IS NOT NULL
THEN
CASE
WHEN
[SUM].[RCVD] IS NULL
THEN '(e) Missing received Date'
WHEN
[SUM].[RCVD] IS NOT NULL
THEN
CASE
WHEN
[SUM].[RCVD] <= [SUM].[MD-DS] AND
[SUM].[RCVD] <= [SUM].[MN-DS]
THEN 'Decision Both'
WHEN
[SUM].[RCVD] > [SUM].[MD-DS] AND
[SUM].[RCVD] > [SUM].[MN-DS]
THEN 'Waiting for NEW decision'
WHEN
[SUM].[RCVD] > [SUM].[MD-DS] AND
[SUM].[RCVD] <= [SUM].[MN-DS]
THEN '(c) Decision Mental'
WHEN
[SUM].[RCVD] <= [SUM].[MD-DS] AND
[SUM].[RCVD] > [SUM].[MN-DS]
THEN '(c) Decision Medical'
END /*[LEVEL2.1-4]*/
END /*[LEVEL2.1-3]*/
END /*[LEVEL2.1]*/
/* ---------------------------------------------------------------------- */
WHEN
[SUM].[MD-RA] IS NOT NULL AND
[SUM].[MN-RA] IS NULL
THEN
CASE
WHEN
[SUM].[MD-DS] IS NULL
THEN '(e) MD re-assess without assess'
WHEN
[SUM].[MD-RA] < [SUM].[MD-DS]
THEN '(e) MD re-assess before assess'
WHEN
[SUM].[MD-RA] >= [SUM].[MD-DS]
THEN '(c) Re-assessment Decision Medical'
END /*[LEVEL2.2]*/
/* ---------------------------------------------------------------------- */
WHEN
[SUM].[MD-RA] IS NULL AND
[SUM].[MN-RA] IS NOT NULL
THEN
CASE
WHEN
[SUM].[MN-DS] IS NULL
THEN '(e) MN re-assess without assess'
WHEN
[SUM].[MN-RA] < [SUM].[MN-DS]
THEN '(e) MN re-assess before assess'
WHEN
[SUM].[MN-RA] >= [SUM].[MN-DS]
THEN '(c) Re-assessment Decision Mental'
END /*[LEVEL2.3]*/
/* ---------------------------------------------------------------------- */
WHEN
[SUM].[MD-RA] IS NOT NULL AND
[SUM].[MN-RA] IS NOT NULL
THEN
CASE
WHEN
[SUM].[RCVD] IS NULL
THEN '(e) Missing received Date'
WHEN
[SUM].[RCVD] IS NOT NULL
THEN
CASE
WHEN
[SUM].[RCVD] <= [SUM].[MD-RA] AND
[SUM].[RCVD] <= [SUM].[MN-RA]
THEN 'Re-assessment Decision Both'
WHEN
[SUM].[RCVD] > [SUM].[MD-RA] AND
[SUM].[RCVD] > [SUM].[MN-RA]
THEN 'Waiting for NEW Re-assessment decision'
WHEN
[SUM].[RCVD] > [SUM].[MD-RA] AND
[SUM].[RCVD] <= [SUM].[MN-RA]
THEN '(c) Re-assessment Decision Mental'
WHEN
[SUM].[RCVD] <= [SUM].[MD-RA] AND
[SUM].[RCVD] > [SUM].[MN-RA]
THEN '(c) Re-assessment Decision Medical'
END /*[LEVEL2.3-3]*/
END /*[LEVEL2.3]*/
/* ---------------------------------------------------------------------- */
ELSE 'Unknown'
END) [MyCategory]
,(CASE
WHEN 'a' is null then 'b'
WHEN 'a' is not null then 'b'
end) [greduygdg]
,(CASE
WHEN 1 = 2 then 'b'
WHEN 2 = 1 then 'b'
else 'c'
end) [grefeewfrewf]
FROM
[SUMMARY] [SUM]
WHERE
[SUM].[Med_Process_Start] = 1
AND [SUM].[CURR-APPLICATION] = 1
现在问题出在[MyCategory]列CASE周围。我已经走了这么远，并且避免了可笑的复杂和视觉上可怕的代码，我想将其隔离为CTE，然后访问其中的列以做其他事情。
但是，如果我尝试访问[MyCategory]列将其包装为CTE甚至嵌套为子查询，则查询将失败，但并非总是失败。如果我SELECT *的所有列都经过甚至超过SELECT *，然后使用WHERE子句，我可以限制基于该列返回的行。
但是，如果我选择SELECT [MyCategory]，则会得到以下信息：
===================================
An error occurred while reading data from the query result set.
Statement(s) could not be prepared. (Microsoft SQL Server Report Builder)
===================================
Statement(s) could not be prepared. (.Net SqlClient Data Provider)
------------------------------
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=13.00.5264&EvtSrc=MSSQLServer&EvtID=8180&LinkId=20476
------------------------------
Server Name: ***********
Error Number: 8180
Severity: 16
State: 1
Line Number: 1
------------------------------
Program Location:
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlDataReader.HasMoreRows()
at System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout)
at System.Data.SqlClient.SqlDataReader.Read()
at Microsoft.ReportingServices.DataExtensions.DataReaderWrapper.Read()
at Microsoft.ReportingServices.QueryDesigners.QueryResultsDlgStorage.EnsureRowsInBuf(Int64 FirstRowIndex, Int64 LastRowIndex)
如果我使用*但直接访问失败，对我来说查询如何包含列将对我毫无意义？
我不要求重写代码，但我看不出如何解决此问题。我尝试过使用不同的别名，以防发生冲突。不同的列名；紧接着，我添加了一些其他case语句（简单），并能够很好地访问它们。
这非常令人沮丧，您能给我的任何指教将不胜感激。
谢谢