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optimizing sql joins?

I've read (and lost the reference) that when doing joins
of this form:

A.col = B.col and A.col = C.col

It is "helpful" to explicitlty add the
implied join:

B.col = C.col

This is mathematically redundant, but may give
the SQL optimiser another (potentially useful/fast)

Can anybody comment, (or remember where I might
have seen this tip)?

Jul 19 '05 #1
0 2760

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