Re: Decide witch table within a union

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On Sun, October 29, 2006 3:34 pm, Børge Holen wrote:
> Hi.
> I got this working (almost)
> How do I decide (inside?) the whileloop the table_nr, 1 to 4 witch the
> link is
> echo'ed from.
>
> I could add another field in each table telling witch table it is.
> Easy
> solution, but feels like polluting the db.
>
> Also I could do another loop to check another of the printed fields up
> agains
> witch table is used, but that adding to the slowness of this union
> stuff, it
> would take forever, if the union in itself is slow or the fact that
> I'm
> cutting the message field after 100 characters I dunno.
>
> This is anyway the main code wherein the problem lies:
>
> $sql="	(select * from table_1 WHERE pid='0' order by id desc limit 10)

select *, 'table_1' from table_1 ...

> union
> 		(select * from table_2 WHERE pid='0' order by id desc limit 10)

select *, 'table_2' from table_2 ...

This gives you an extra field with the table name in it.

You may not be able to use * any more, and have to name all the fields
you actually want.

Which is a better practice anyway.

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