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Fixing Table alias inside a dynamic SQL query

Posted on 2016-10-09
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Last Modified: 2016-10-09
I had this question after viewing Fixing Temp Table inside dynamic query.

How to fix the table alias here:
DECLARE @AsIsTable nvarchar(MAX);
DECLARE @ChangingAsIsColumnsToTheEquivelantValuesSQL varchar (MAX);
SET @ChangingAsIsColumnsToTheEquivelantValuesSQL = N'SELECT
 ID
,(SELECT ServiceTypeID FROM [dbo].[tb_List_ServiceType] WHERE ServiceTypeName = R.ServiceTypeName) As ServiceTypeID
FROM' +@AsIsTable + ' AS R';

EXECUTE(@ChangingAsIsColumnsToTheEquivelantValuesSQL)

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Thanks a lot in advance.
Harreni
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Question by:Harreni
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2 Comments
 
LVL 49

Accepted Solution

by:
PortletPaul earned 500 total points
ID: 41835670
"Fixing" implies there is a known problem and you are not referring to temp tables in your dynamic sql. So what is the exact problem?

Also I'm not sure why you are using a "correlated subquery" in your select clause, but you could add an alias to that table, e.g.
DECLARE @AsIsTable nvarchar(MAX);
DECLARE @ChangingAsIsColumnsToTheEquivelantValuesSQL varchar (MAX);
SET @ChangingAsIsColumnsToTheEquivelantValuesSQL = N' SELECT
          R.ID
        , (
                SELECT
                      MAX(N.ServiceTypeID)
                FROM [dbo].[tb_List_ServiceType] AS N
                WHERE N.ServiceTypeName = R.ServiceTypeName
          )
          AS ServiceTypeID
    FROM ' + @AsIsTable +' AS R'

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0
 

Author Closing Comment

by:Harreni
ID: 41835737
Thanks a lot PortletPaul for your help and explanation.
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