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Message Posted: Fri, 27 Feb 2004 @ 21:25:18 GMT

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I would have to say that without qualifying the "tool" in question that it depends....Derived tables certainly have had use in the past as a means to guide the RDBMS to what often was a more efficient execution plan in certain situations. Teradata is not unique in that vein and that really is a execution/performance question. Hopefully that type of use will be come a moot issue as the optimizer is made more intelligent per Fred's comments about NCR intentions in that area (and that will truly be a glorious day!). Beyond that however I think of "derived tables" from a SQL syntax/coding standpoint. In that vein, they serve many useful purposes and I think they have entered the SQL lexicon permanently and are here to stay....

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