On Mon, 18 Aug 2003 terry@ashtonwoodshomes.com wrote:
> Here's what I have (simplified)
>
> SELECT t1.fid, t1.t1_data, t2.vid, t2.t2_data, t3.t3_data
> FROM t1, t2, t3
> WHERE t1.fid = X
> AND t2.vid = Y
> AND t3.fid = t1.fid
> AND t3.vid = t2.vid
>
> Now, I discover that the record in t3 may not always exist, so somehow I
> want to do an outer join...
>
> SELECT t1.fid, t1.t1_data, t2.vid, t2.t2_data, t3.t3_data
> FROM t1, t2, OUTER JOIN t3 ON (t3.fid = t1.fid AND t3.vid = t2.vid)
> WHERE t1.fid = X
> AND t2.vid = Y
Maybe:
FROM t1 CROSS JOIN t2 LEFT OUTER JOIN t3 ON ...
