From: | Steven Dahlin <pgdb(dot)sldahlin(at)gmail(dot)com> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | update using recursion |
Date: | 2011-04-14 21:53:59 |
Message-ID: | BANLkTi=cbcEfZofjCoUXgXrRd5Ews72BnA@mail.gmail.com |
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Lists: | pgsql-sql |
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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