Hi Andreas, The rule you've given only works for an update which changes the name.
If I do another update which changed the colour instead of the name, that rule wouldn't do the right thing. Instead, I'm looking for something which, with a single 'rule' (or whatever the mechanism ends up being), intercepts *any* update on apples, and applies the changes to the pears table instead, as if the only change that occurred was a change of table name. I can achieve this in the application which generates the sql commands, but someone else suggested it was possible with rules, but it may not be the case. Thanks! Andy -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andreas Kretschmer Sent: 20 November 2005 16:17 To: pgsql-sql@postgresql.org Subject: Re: [SQL] Is it possible to redirect an update/insert/delete to a different table? Andy Ballingall <[EMAIL PROTECTED]> schrieb: > Hello Peter, > > I'm glad it's possible, but I can't see how from the documentation. > > Say if I have a table called 'apples' and a table called 'pears'. > > What would the rule look like that would remap all updates on apples so that > they were applied to pears instead? create rule apples_pears_update as on update to apples do instead update pears set name= NEW.name where id=NEW.id ; test=# select * from apples ; id | name ----+------ 1 | a (1 row) test=# select * from pears ; id | name ----+------ 1 | b (1 row) test=# update apples set name = 'c' where id = 1; UPDATE 1 test=# select * from pears ; id | name ----+------ 1 | c (1 row) http://www.postgresql.org/docs/8.1/interactive/rules-update.html HTH, Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889° ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.4/176 - Release Date: 20/11/2005 ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
