Обсуждение: SQL - update table problem...

Hi,

i'm trying to make update on multiple tables but don't know how.
is something like this posible with postgresql?

update table1
join table2 on (table1.id=table2.t1)
join table3 on (table2.id=table3.t2)
set table1.name='test', table2.sum=table1.x+table2.y,
table3.cell='123456789'
where table1.id=6

i know that this syntax is not supported with postgres but i tried to
rewrite the code using this synopsis:

UPDATE [ ONLY ] table SET column = { expression | DEFAULT } [, ...]
  [ FROM fromlist ]
  [ WHERE condition ]

i failed again.
updating multiple tables, can it be done?

thanks for help

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Hi!

According to the synopsis of UPDATE you just can update one table at a time.
Just use more UPDATE commands inside a transaction.

-- Matthias

> -----Original Message-----
> From: pgsql-general-owner@postgresql.org
> [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Marko Rihtar
> Sent: Monday, November 13, 2006 2:21 PM
> To: pgsql-general@postgresql.org
> Subject: [GENERAL] SQL - update table problem...
>
>
> Hi,
>
> i'm trying to make update on multiple tables but don't know how.
> is something like this posible with postgresql?
>
> update table1
> join table2 on (table1.id=table2.t1)
> join table3 on (table2.id=table3.t2)
> set table1.name='test', table2.sum=table1.x+table2.y,
> table3.cell='123456789'
> where table1.id=6
>
> i know that this syntax is not supported with postgres but i tried to
> rewrite the code using this synopsis:
>
> UPDATE [ ONLY ] table SET column = { expression | DEFAULT } [, ...]
>   [ FROM fromlist ]
>   [ WHERE condition ]
>
> i failed again.
> updating multiple tables, can it be done?
>
> thanks for help
>
> _________________________________________________________________
> FREE pop-up blocking with the new MSN Toolbar - get it now!
> http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/
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>
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Marko Rihtar wrote:
> Hi,
>
> i'm trying to make update on multiple tables but don't know how.
> is something like this posible with postgresql?
>
> update table1
> join table2 on (table1.id=table2.t1)
> join table3 on (table2.id=table3.t2)
> set table1.name='test', table2.sum=table1.x+table2.y,
> table3.cell='123456789'
> where table1.id=6

I don't know of an SQL variant to handle this case. Usually people are
trying to update a single table based on joining to several others.

In your case you'll have to issue three update statements wrapped in a
transaction.

--
   Richard Huxton
   Archonet Ltd