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  3. April 2009

Re: SQL UNION mystery

In general, SQL doesn't guarantee the order of rows unless you explicitly specify that order. Add an ORDER BY clause to your SELECT and all will be well.

Joe

Has anyone run into this problem before?
Through ODBC I have set up an Excel to import into a worksheet the
records from two separate tables with the same record layout. Here is
the code:
SELECT * FROM LIBRARYA.FILE123 FILE123 UNION ALL
SELECT * FROM LIBRARYB.FILE123 FILE123
Normally it pulls in the records the way we expect it to with the
records from LIBRARYA appearing before the records for LIBRARYB. Every
few weeks the order is mysteriously reversed, where LIBRARYB appears
before LIBRARYA. The records for each file are still in the correct
order, just the file order is reversed. At first I thought this had
something to do with Excel, but when I run the same code on our i system
I get the same results.
Any enlightenment as to why this is happening would be greatly
appreciated. A solution would cause me to do handstands.


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