On Tue, 23 Apr 2002, David Link wrote:
> Hi.
>
> We have found that by using an Outer Join it speeds up this query
> considerably.
>
> Why is that?
>
> According to the explain plan the hold up has to do with a single nexted
> loop and a "Materilize"? This makes no sense to me. Can some one
> explain.
>
> Thanks. -David
>
> The difference between these two queries is the first uses an outer join
> between u and t, while the second (the slower) uses a straight forward
> join).
See:
http://www.postgresql.org/idocs/index.php?explicit-joins.html
You can probably use an inner join as well, you just need to use
the explicit join syntax.
