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Message Posted: Thu, 09 Sep 2004 @ 15:42:33 GMT

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Are you sure your UPDATE statement is logically correct? AND has precedence over OR, so I think you want parentheses around the last two OR'ed conditions. As written, this statement will fail if there is a NULL last_sale_date in the target table and the source table has more than one row. This will likely make a big difference in the query plan and performance as well.

And is there some reason why (branch_id, customer_no) is not a UNIQUE primary index? Again, you will have problems if more than one qualifying row with the same (branch_id, customer_no) occurs in the source table.

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