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09.10.2008 at 05:04AM PDT, ID: 23718817
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9.4

linked server query - WHERE not IN does not return expected results

Asked by RichyD in SQL Query Syntax, SQL Server 2005

Tags: , ,

I have two SQL 2005 Servers and I was trying to right a simple query that copied missing table values from the primary database to the seconday database. The tables in the databases have the same structure.

At first I created the query as follows:

select * from PrimaryServer.PrimaryDB.dbo.tbl_Items where not ItemID in (select ItemID from SecondaryServer.SecondaryDB.dbo.tbl_Items)

But for some strang reason this wouldn't return the missing rows. I tried casting the values but it made no difference.

However if I change the query to a join, the problem is solved!
The following code works as expected:

Select *from PrimaryServer.PrimaryDB.dbo.tbl_Items as PrimaryTable
left join SecondaryServer.SecondaryDB.dbo.tbl_Items as SecondaryTable on
PrimaryTable.ItemID = SecondaryTable.ItemID
where SecondaryTable.ItemID is null

Any ideas why the first query doesn't work, but the second query does?



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[+][-]09.10.2008 at 05:07AM PDT, ID: 22437403

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[+][-]09.10.2008 at 05:07AM PDT, ID: 22437405

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About this solution

Zones: SQL Query Syntax, SQL Server 2005
Tags: Microsoft, SQL Server 2005, 9.0.3233 and 0.0.3068
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Solution Provided By: momi_sabag
Participating Experts: 3
Solution Grade: A
 
 
[+][-]09.10.2008 at 05:14AM PDT, ID: 22437461

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