> As there are no restrictions on the data
> being brought back what is wrong with
> doing a full table scan of each?
True there are no restrictions. The query is not going to return just one
row where product number = 443. It's going to cover all of both tables it
joins.
A simple unrestricted join of two tables will be faster if you just do a
full table scan, you avoid the overhead of also looking at the indexes. But
when SUM / GROUP BY are added this general rule doesn't apply and indexes
will help significantly.
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Author: Greg Moore
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