Microsoft KB Archive/299285

= FIX: Query with Complex Correlated Subquery May Cause Unexpected Results in Aggregate Functions =

Article ID: 299285

Article Last Modified on 11/5/2003

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APPLIES TO


 * Microsoft SQL Server 2000 Standard Edition

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This article was previously published under Q299285



BUG #: 352826 (SHILOH_BUGS)



SYMPTOMS
Aggregate functions may return incorrect results in a query that has a correlated subquery. The showplan for the query will show a spool operation followed by a nested loop join.



RESOLUTION
To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

290211 INF: How to Obtain the Latest SQL Server 2000 Service Pack



WORKAROUND
You can add a merge or hash join hint in the FROM clause of the inner query to remove the spool operation from the query plan. You can also add appropriate indexes so that the optimizer will choose a different query plan that does not use the spool operation.



STATUS
Microsoft has confirmed that this is a problem in SQL Server 2000. This problem was first corrected in SQL Server 2000 Service Pack 1.

Additional query words: Aggregates, correlated subquery, spool

Keywords: kbbug kbfix kbsqlserv2000sp1fix KB299285

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