> There are two ways to rewrite this query, with a correlated subquery:
> 
>  SELECT *
>  FROM table_a AS x
>  WHERE NOT EXISTS (SELECT 1
>                    FROM table_b AS y
>                    WHERE x.id  = y.id
>                      AND x.col = y.col)
> 
> or with an outer join:
> 
>  SELECT x.*
>  FROM      table_a AS x
>  LEFT JOIN table_b AS y USING (id, col)
>  WHERE y.id IS NULL

Hi Clemens,
Totally missed the boat on those two.

Much appreciated,
jlc
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