Andreas Haumer wrote:
> You could try to use PosgreSQL's ctid system column to join on like this:
>
> test=# select *,ctid from t1;
> a | b | ctid
> - ---+---+-------
> 2 | 2 | (0,1)
> 3 | 5 | (0,2)
> 4 | 7 | (0,3)
> 9 | 0 | (0,4)
>
>
> test=# select *,ctid from t2;
> c | d | ctid
> - ---+---+-------
> 4 | 5 | (0,1)
> 7 | 3 | (0,2)
> 3 | 2 | (0,3)
> 1 | 1 | (0,4)
> 2 | 0 | (0,5)
>
>
> test=# select * from t1 right outer join t2 on (t1.ctid=t2.ctid);
> a | b | c | d
> - ---+---+---+---
> 2 | 2 | 4 | 5
> 3 | 5 | 7 | 3
> 4 | 7 | 3 | 2
> 9 | 0 | 1 | 1
> | | 2 | 0
>
>
> Note that this is of course very platform specific. On Oracle
> you could use rownum, for example.
> I don't have a more portable solution on hand right now.
>
> HTH
Thanks, I just found out about ctid. I was thinking on a rownum
equivalent too, actually.
I guess a more portable solution would be creating a temporary table for
each table to add the ctid/"row counter" equivalent, and then join on that.
--
dave
