From: Peter Brawley
Date: April 13 2005 3:39am
Subject: Re: LEFT JOINS same data twice?
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Chris,

Sure, you can join a table multiple times. You're missing a FROM clause 
and you seem to put column names where table names or aliases ought to 
be. Is this ...

SELECT
  tlb1.DepartureLocation AS Departure,
  tbl1.DepartureLocation AS Destination
FROM tbl1
LEFT JOIN tbl2 ON tbl2.DepartureID=tlb1.LocationID
LEFT JOIN tbl2 ON tbl2.ArrivalID=tbl1.LocationID
ORDER BY tbl2.Time;

what you mean?

PB

-----

Chris Knipe wrote:

> Hi,
>
> Is it possible to left join the same data twice?
>
> TBL ONE:
> LocationID
> Location, varchar(100)
>
> TBL TWO:
> DepartureID,
> ArrivalID,
> Time
>
> SELECT tlb1.DepartureLocation AS Departure, tbl1.DepartureLocation AS 
> Destination LEFT JOIN DepartureLocation ON 
> tlb2.DepartureID=tlb1.LocationID LEFT JOIN DepartureLocation ON 
> tbl2.ArrivalID=tbl1.LocationID ORDER BY tbl2.Time etc etc etc
>
>
> I get
>
> ERROR 1066 (42000): Not unique table/alias: 'tbl1'
>
>
> Thanks.
>
>
>
> -- 
> Chris.
>
> I love deadlines. I especially love the whooshing sound they make as 
> they fly by..." - Douglas Adams, 'Hitchhiker's Guide to the Galaxy'
>


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