Alban Hertroys <alban@magproductions.nl> writes:
> However, mm_product.number always matches either mm_insrel.snumber or
> mm_insrel.dnumber (source and destination respectively). The other way
> around this isn't the case; then snumber and dnumber match number-fields
> in other tables (they always do).
Oh, then we are looking at the wrong things: we should be comparing the
histograms of the fields that are being used as the join keys in this
query. I had thought they were both "number", but I must be confused.
regards, tom lane
