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BUG #: 470536 (SQL Server 8.0)
Microsoft distributes SQL Server 2000 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2000 fix release.
When you run a query that contains a UNION ALL operator, a TOP clause, and an ORDER BY clause to retrieve data from a SQL Server database, you may notice that the data that is returned in the result is not consistent. The result you receive when the query is run the first time differs from the result you receive in successive runs of the same query.
You may notice similar behavior even after you run the DBCC DROPCLEANBUFFERS Transact-SQL command to clean the buffer.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
290211 How to obtain the latest SQL Server 2000 service pack
The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.