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Message Posted: Fri, 09 Jul 1999 @ 15:29:20 GMT
Product joins are not always bad, but should be looked at carefully when they use large tables. The size of the spool file for a product join is the product of each row in table A times each row in table B. So a 10 million row table times a 100 million row table is a big spool file. A merge join merges the results file which is usually, but not always faster.
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