Thanks for the reply. I can do this at the higher level; but this antijoin
thing is a small part of a bigger project. So I want to do it internally in
one of the joins. Does anyone have experience in storing tupleslpts and
comparing them ??
Gregory Stark wrote:
>
> "Suresh_" <suiyengar@yahoo.com> writes:
>
>> I want to add an antijoin operator to PostgreSql.
>
> I think you can already do what you want like this:
>
> SELECT *
> FROM A FULL OUTER JOIN B ON (x=y)
> WHERE x IS NULL
> OR y IS NULL
>
> So for example:
>
> postgres=# select * from a;
> i
> ---
> 1
> 2
> (2 rows)
>
> postgres=# select * from b;
> i
> ---
> 2
> 3
> (2 rows)
>
> postgres=# select * from a full outer join b on (a.i=b.i) where a.i is
> null or b.i is null;
> i | i
> ---+---
> 1 |
> | 3
> (2 rows)
>
> --
> Gregory Stark
> EnterpriseDB http://www.enterprisedb.com
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
>
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