This solution gave me the result I need, but it seems the process takes longer when COALESCE is added.
What do you mean with the comment of "and you are happy with its performance" ? Does it have to do with performance? Regards, Jorge Maldonado On Tue, Feb 5, 2013 at 10:07 PM, Jasen Betts <ja...@xnet.co.nz> wrote: > On 2013-02-06, JORGE MALDONADO <jorgemal1...@gmail.com> wrote: > > --f46d0401fb2fcb805e04d50354b1 > > Content-Type: text/plain; charset=ISO-8859-1 > > > > I have an UPDATE query with the following general structure: > > > > UPDATE table1 SET (SELECT field FROM table2 WHERE conditions ORDER BY > > order_field LIMIT 1) > > assuming you mean this, and you are happy with its performance. > > UPDATE table1 SET field1 = (SELECT field FROM table2 WHERE conditions > ORDER BY > order_field LIMIT 1) > > > > Is it possible to assign a default value in case no results are returned > by > > the SELECT statement? > > use coalesce. > > UPDATE table1 SET field1 = coalesce( (SELECT field FROM table2 WHERE > conditions ORDER BY > order_field LIMIT 1) , default_value ) > > > > > -- > ⚂⚃ 100% natural > > > > -- > Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-sql >
