Simulating an outer join - Mailing list pgsql-general

I have been thinking about how to simulate an outer join.  It seems the
best way is to do:

    SELECT tab1.col1, tab2.col3
    FROM tab1, tab2
    WHERE tab1.col1 = tab2.col2
    UNION ALL
    SELECT tab1.col1, NULL
    FROM tab1
    WHERE tab1.col1 NOT IN (SELECT tab2.col2 FROM tab2)

Comments?  I know someone was asking about this recently.

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