Merges wont work because they dont allow inserts. But I'll check out UNION.
Thanx
- Deryck H
- http://www.comp-u-exchange.com
----- Original Message -----
From: "Jeremy Zawodny" <[EMAIL PROTECTED]>
To: "Deryck Henson" <[EMAIL PROTECTED]>
Cc: "MySQL" <[EMAIL PROTECTED]>
Sent: Wednesday, September 12, 2001 2:56 AM
Subject: Re: How to use JOINS
> On Wed, Sep 12, 2001 at 02:13:59AM -0500, Deryck Henson wrote:
> >
> > OK, well, mysql has LEFT JOINS, right? OK then, in that case, how
> > the heck do I use them?! I need to join 14 tables (with the exact
> > same structure, columns) together and view all of there contents
> > with a WHERE clause like this:
> >
> > SELECT * FROM t1, t2, t3, t4, t5, etc ORDER BY date DESC
> >
> > or
> >
> > SELECT * FROM theworks WHERE userid = 'userid'
> >
> > Any suggestions? I need that join. WHY? Because it's ambiguous if
> > I dont have it.
>
> I'm not entirely sure, but it sounds like you might be confusing a
> JOIN with a UNION.
>
> JOINs are used to bring together related records ("related" in the
> RDBMS sense of "related") into larger records composed of columns from
> each table.
>
> A UNION allows you to treat several similarly structured tables as if
> the are one large table. MySQL doesn't yet have UNIONs (4.0 will),
> but it does have MERGE tables which allow you to combine several
> tables into a sort of virtual table against which you can write
> queries.
>
> Hope this helps,
>
> Jeremy
> --
> Jeremy D. Zawodny, <[EMAIL PROTECTED]>
> Technical Yahoo - Yahoo Finance
> Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936
>
> MySQL 3.23.41-max: up 6 days, processed 131,748,231 queries (248/sec. avg)
>
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