From: | Jasen Betts <jasen(at)xnet(dot)co(dot)nz> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: UPDATE in a specific order |
Date: | 2010-12-16 19:58:50 |
Message-ID: | iedr1q$dv1$1@reversiblemaps.ath.cx |
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Thread: | |
Lists: | pgsql-sql |
> I need to make update of table1 with data on table2 in the order of id
> of table2
that looks like EAV. is it?
> I=B4m trying to do an update like this:
that's not going to work.
perhaps you can rewrite the from part to only return one row for every
table1_fk, this one row will combine several rows from table2
> The "FROM ( SELECT * FROM table2 ORDER BY id ) tHist" is a try to
> force a specific order on table2 to update table1
> but this isn=B4t working.
will only work if the optimiser picks index join on table 1
> There are some way to do this with a UPDATE statement ?
to do it with an update statement you need no more than one rows in the
from for each row in the target.
easiest non update statement approach is probably to use a plpgsql
function with a loop.
basically you need to find another way to do it.
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