| From: | hubert depesz lubaczewski <depesz(at)gmail(dot)com> |
|---|---|
| To: | Alex <alex(at)meerkatsoft(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Delete Question |
| Date: | 2005-12-07 07:27:57 |
| Message-ID: | 9e4684ce0512062327t728e1873pf308f10fcee0406e@mail.gmail.com |
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| Lists: | pgsql-general |
On 12/7/05, Alex <alex(at)meerkatsoft(dot)com> wrote:
>
> I have a table where I store changes made to an order. The looks like
> ProdID, ChangeDate, Change1, Change2, ... etc.
> Some ProdIDs have multiple records.
> Is there an easy way to delete all records of a ProdID except the most
> recent (ChangeDate is timestamp) one? Preferably in one SQL statement?
>
delete from table_name where exists (select * from table_name x where
x.prodid = table_name.prodid and x.changedate > table_name.changedate);
this should work.
depesz
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