How to Misuse SQL's FROM Clause
Subject:   Doesn't work for Oracle, Db2 UDB, DB2 or SQLserver
Date:   2006-03-21 15:55:13
From:   mm0
I assembled sample data from my ssytem to test this out because I didn't believe it was generalizable. It's the opposite of the suggestion for Oracle 8/9 and sqlserver in my test databases, and DB2 and DB2 UDB rewrite the subquery as a join.

Tables are indexed on constraint columns, indexed on join columns, cust table has ~25 million rows and order table has ~60 million rows.

I don't have a mysql instance up on these servers to test with. I think you're making a generalization of a mysql-specific suggestion.

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