JOIN ignores last clause

[johnmudd]

SELECT       p.patstoreid, p.patkey, p.stseq,       a.keystoreid, a.keykey, a.seq,       (p.patstoreid = a.keystoreid) as match,       (p.stseq != a.seq) as mismatch   FROM patient p, address a   WHERE p.patstoreid = a.keystoreid AND p.patkey = a.keykey AND p.stseq = a.seq

The results ignore the "p.stseq = a.seq" clause. But by listing the values for p.stseq, a.seq, match and mismatch I can see that my code is providing the correct values and Postgres makes the expected comparisons.

Sample correct results: 102146 | 42 | 1 | 102146 | 42 | 1 | t | f 102146 | 171 | 1 | 102146 | 171 | 1 | t | f 102146 | 256 | 1 | 102146 | 256 | 1 | t | f 102146 | 288 | 1 | 102146 | 288 | 1 | t | f

Sample incorrect results: 102146 | 1818 | 2 | 102146 | 1818 | 1 | f | t 102146 | 2049 | 2 | 102146 | 2049 | 1 | f | t 102146 | 3823 | 2 | 102146 | 3823 | 1 | f | t 102146 | 4271 | 4 | 102146 | 4271 | 1 | f | t

It works if I remove the "p.patstoreid = a.keystoreid" clause for this particular data where those values are always the same. But I need that clause for other datasets where the values don't always match.

[frbsfri]

Why there is no reaction on any of the posts which are quire helpful for other people as well? Please be more active dear Multicorn community :)