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Message Posted: Thu, 06 Mar 2008 @ 23:24:37 GMT

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Subj:   Re: Teradata Query with Subselect
From:   Michael Larkins


You can only put a subselect in a WHERE or a FROM. When it is used in the WHERE as a subquery, it allows for a comparison to determine which rows from the main select to return. When written in the FROM it is a derived table and columns can be selected and joined from it.

However, as other people have indicated, there is no need for you to use a sub-select when writing it as a normal JOIN works just fine.


Michael Larkins
Certified Teradata Master
Certified Teradata SQL Instructor

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