| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Steve Lefevre <lefevre(dot)10(at)osu(dot)edu> |
| Cc: | pgsql-novice(at)postgresql(dot)org |
| Subject: | Re: Joins within a table |
| Date: | 2007-06-13 00:51:09 |
| Message-ID: | 28878.1181695869@sss.pgh.pa.us |
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| Lists: | pgsql-novice |
Steve Lefevre <lefevre(dot)10(at)osu(dot)edu> writes:
> I'm trying to do a JOIN within a table. In MySQL, I would do
> SELECT main_table.field, join_table.field
> FROM main_table
> LEFT JOIN main_table AS join_table ON join_table.id = main_table.parent_id
Yeah, that's the same way you'd do a self-join in Postgres.
> However, in the Postgres documentation, I don't see anything on JOIN AS.
Where did you look? Maybe you are confusing the alias clause with the
join clause --- they are two different constructs.
regards, tom lane
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