Thread: Update on Insert
Hi Everyone, Given a table "Items" with a PK "item1" and "Qty" - a numeric column I'd like to define a way in Postgres to insert when item11 doesn't exist already in "Items" and update the Qty by adding the new quantity to the existent when the item11 exists. What is a good approach and where should I be looking for details. Thanks. Sebastian
On Mon, Nov 16, 2009 at 1:31 PM, SebiF <sfeher@gmail.com> wrote: > Hi Everyone, > > Given a table "Items" with a PK "item1" and "Qty" - a numeric column > I'd like to define a way in Postgres to insert when item11 doesn't > exist already in "Items" and update the Qty by adding the new quantity > to the existent when the item11 exists. What is a good approach and > where should I be looking for details. Thanks. > > Sebastian This is not a -hackers question; please use pgsql-general instead. Also see example 38-2 here: http://www.postgresql.org/docs/current/static/plpgsql-control-structures.html ...Robert
SebiF <sfeher@gmail.com> wrote: > Hi Everyone, > > Given a table "Items" with a PK "item1" and "Qty" - a numeric column > I'd like to define a way in Postgres to insert when item11 doesn't > exist already in "Items" and update the Qty by adding the new quantity > to the existent when the item11 exists. What is a good approach and > where should I be looking for details. Thanks. 21:53 < akretschmer> ??upsert 21:53 < rtfm_please> For information about upsert 21:53 < rtfm_please> see http://www.postgresql.org/docs/current/static/plpgsql-control-structures.html#PLPGSQL-UPSERT-EXAMPLE Read that. Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°