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Message Posted: Fri, 02 Jul 2004 @ 11:54:53 GMT
Its a duplicate across all amps and then crutially a sort in the same step. This means that Teradata can use a merge join as the duplicated spool is now in join columns sequence.
With a duplicate across all amps and then a product join, there is no sort in the duplication step as it would not be necessary.
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