Re: Displaying two tables side by side

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Hi!

David Garamond wrote:
> How can you display two tables side by side? Example:
>
>> select * from t1;
>  a | b
> ---+---
>  2 | 2
>  3 | 5
>  4 | 7
>  9 | 0
>
>> select * from t2;
>  c | d
> ---+---
>  4 | 5
>  7 | 3
>  3 | 2
>  1 | 1
>  2 | 0
>
> Intended output:
>  a | b | c | d
> ---+---+---+---
>  2 | 2 | 4 | 5
>  3 | 5 | 7 | 3
>  4 | 7 | 3 | 2
>  9 | 0 | 1 | 1
>    |   | 2 | 0
>
> Each table has no keys (and no OIDs). Order is not important, but each
> row from each table needs to be displayed exactly once.
>
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 | 53 | 5 | 7 | 34 | 7 | 3 | 29 | 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

- - andreas

- --
Andreas Haumer                     | mailto:andreas@xss.co.at
*x Software + Systeme              | http://www.xss.co.at/
Karmarschgasse 51/2/20             | Tel: +43-1-6060114-0
A-1100 Vienna, Austria             | Fax: +43-1-6060114-71
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