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Message Posted: Thu, 05 Mar 2009 @ 21:34:52 GMT

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Subj:   Re: Data access using views
From:   Michael Larkins

madhu das:

Not sure if much more detail is required. Teradata does not read the data out of a table, put it into spool and then select from it - no additional spool overhead required.

If you where to do the following:

     EXPLAIN sel columns from tablename


     EXPLAIN sel columns from viewname /* assumes view of columns & rows */

there is no difference in the output to the point that the view name does not appear anywhere in the output from the EXPLAIN

so if the original select would use an index the view would use the index doing the same select.


Michael Larkins
Certified Teradata Master
Certified Teradata SQL Instructor

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