From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Barry Lind <barry(at)xythos(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Something I'd like to try... |
Date: | 2000-10-03 19:03:41 |
Message-ID: | 29636.970599821@sss.pgh.pa.us |
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Lists: | pgsql-sql |
Barry Lind <barry(at)xythos(dot)com> writes:
> I have a table that stores a hierarchy. Sometimes in an update I want
> to join back to the same table to get other information related to
> children or parent rows. In Oracle I can do this using the alias, but
> in Postgresql I cannot.
> update table_foo f1
> set column_b = 1
> where exists (select column_a from table_foo f2
> where f2.parent_foo_id = f1.foo_id);
What's wrong with the spec-compliant
update table_foo
set column_b = 1
where exists (select column_a from table_foo f2
where f2.parent_foo_id = table_foo.foo_id);
?
regards, tom lane
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