| From: | Jaime Casanova <systemguards(at)gmail(dot)com> |
|---|---|
| To: | Scott Ford <Scott(dot)Ford(at)bullfrogpower(dot)com> |
| Cc: | pgsql-novice(at)postgresql(dot)org |
| Subject: | Re: Removing duplicate entries |
| Date: | 2006-01-11 20:05:37 |
| Message-ID: | c2d9e70e0601111205wa67a217k19a8cb07641c86b@mail.gmail.com |
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| Lists: | pgsql-novice |
On 1/11/06, Scott Ford <Scott(dot)Ford(at)bullfrogpower(dot)com> wrote:
> Hi all -
>
> I have two tables - customers and documents. Each customer can be
> related to several different documents. There has been a bug in some
> software that's been duplicating the addition of a certain type of
> document for the customers. Even though each customer can have
> documents of the same type, in this case I don't want it.
>
> customers
> customer_id
> ...
>
> documents
> customer_id
> document_id
> document_type_id
> ...
>
> So, for example, there are two documents with the same document_type_id
> associated with one customer.
>
> Can someone help me with a SQL statement that might help me remove the
> duplicate documents for a certain document_type_id?
>
> Thanks,
> Scott.
>
i think what you need is a SQL to _search_ all the cases...
then look at them... and deletes them one at a time... that's the
safer way to go...
--
regards,
Jaime Casanova
(DBA: DataBase Aniquilator ;)
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