"Kevin Grittner" <Kevin.Grittner@xxxxxxxxxxxx> writes: > Tom Lane <tgl@xxxxxxxxxxxxx> wrote: >> If it should be less than 1, then what? > 1 - (estimated tuples / estimated distinct values) ? Uh, no. The number we're after is the probability that an outer tuple has at least one unequal value in the inner relation. This is not 1 minus the probability that a *specific* inner value is equal, which is what I think your formula is estimating. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
