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* Update query by joining multiple tables.
@ 2007-01-17 11:20 Moiz Kothari <moizpostgres@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Moiz Kothari @ 2007-01-17 11:20 UTC (permalink / raw)
To: pgsql-sql
Guys,
on page this
http://www.postgresql.org/docs/8.1/interactive/sql-update.html, it is not
specified if a join can be done between multiple tables to update a table, i
tried and it worked just fine for me. Something like this :
Infact update can work between multiple tables to... do something like :
UPDATE employees SET sales_count = a.sales_count FROM accounts as a
WHERE a.name = 'Acme Corporation'
AND employees.id = a.sales_person;
considering sales_count as a column in accounts table.
Regards,
Moiz
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Update query by joining multiple tables.
@ 2007-01-17 12:55 Andrew Sullivan <ajs@crankycanuck.ca>
parent: Moiz Kothari <moizpostgres@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Sullivan @ 2007-01-17 12:55 UTC (permalink / raw)
To: pgsql-sql
On Wed, Jan 17, 2007 at 04:50:18PM +0530, Moiz Kothari wrote:
> http://www.postgresql.org/docs/8.1/interactive/sql-update.html, it is not
> specified if a join can be done between multiple tables to update a table, i
Sure it is:
A list of table expressions, allowing columns from other tables to
appear in the WHERE condition and the update expressions.
a
--
Andrew Sullivan | ajs@crankycanuck.ca
Users never remark, "Wow, this software may be buggy and hard
to use, but at least there is a lot of code underneath."
--Damien Katz
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Update query by joining multiple tables.
@ 2007-01-17 15:01 Shoaib Mir <shoaibmir@gmail.com>
parent: Andrew Sullivan <ajs@crankycanuck.ca>
0 siblings, 0 replies; 3+ messages in thread
From: Shoaib Mir @ 2007-01-17 15:01 UTC (permalink / raw)
To: Andrew Sullivan <ajs@crankycanuck.ca>; +Cc: pgsql-sql
Might be a view and then a rule attached with that can help you out with
doing updates using joins
--------------
Shoaib Mir
EnterpriseDB (www.enterprisedb.com)
On 1/17/07, Andrew Sullivan <ajs@crankycanuck.ca> wrote:
>
> On Wed, Jan 17, 2007 at 04:50:18PM +0530, Moiz Kothari wrote:
> > http://www.postgresql.org/docs/8.1/interactive/sql-update.html, it is
> not
> > specified if a join can be done between multiple tables to update a
> table, i
>
> Sure it is:
>
> A list of table expressions, allowing columns from other tables to
> appear in the WHERE condition and the update expressions.
>
> a
>
> --
> Andrew Sullivan | ajs@crankycanuck.ca
> Users never remark, "Wow, this software may be buggy and hard
> to use, but at least there is a lot of code underneath."
> --Damien Katz
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>
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-- links below jump to the message on this page --
2007-01-17 11:20 Update query by joining multiple tables. Moiz Kothari <moizpostgres@gmail.com>
2007-01-17 12:55 ` Andrew Sullivan <ajs@crankycanuck.ca>
2007-01-17 15:01 ` Shoaib Mir <shoaibmir@gmail.com>
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