From: Steven Dahlin <pgdb.sldahlin@gmail.com>
To: pgsql-sql@postgresql.org
Subject: update using recursion
Date: Thu, 14 Apr 2011 15:53:59 -0600
Message-ID: <BANLkTi=cbcEfZofjCoUXgXrRd5Ews72BnA@mail.gmail.com> (raw)
Is it possible to execute an update using recursion? I need to update
a set of records and also update their children with the same value.
I tried the following query but it gave an error at the "update
schema.table tbl":
with recursive childTbl( pid,
ppid,
proc_id,
other_id )
as ( select prc.pid,
prc.ppid,
prc.proc_id,
prc.other_id
from my_schema.prc_tbl prc
where ( ( prc.proc_path like '%stuff%' )
or ( prc.proc_parameters like '%stuff%' ) )
and ( prc.other_id is null )
union all
select prcsub.pid,
prcsub.ppid,
prcsub.proc_id,
prcsub.other_id
from childTbl prcpar,
my_schema.prc_tbl prcsub
where ( prcsub.ppid = prcpar.pid )
)
update my_schema.prc_tbl prc
set other_id = 101
from childTbl
However, if I do a "select * from childTbl" it works. The docs take
about updates and talk about recursive queries with selects but
nothing seems to cover the joining of the two.
Thanks
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To: pgsql-sql@postgresql.org
Cc: pgdb.sldahlin@gmail.com
Subject: Re: update using recursion
In-Reply-To: <BANLkTi=cbcEfZofjCoUXgXrRd5Ews72BnA@mail.gmail.com>
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