Thanks for that Richard, it's almost what I'm after: So where the un and dm exist then return 1 row
Where the un doestn't exist and dm does then return all sendtos' where the dm exists not just where the un='*' I hope that makes sense. Thanks for you help Nigel Bishop ioko T: +44 (0)1904 435 458 M: +44 (0)7881 624 386 F: +44 (0)1904 435 450 E: [EMAIL PROTECTED] W: www.ioko.com -----Original Message----- From: Richard Huxton [mailto:[EMAIL PROTECTED] Sent: 03 February 2006 11:02 To: Nigel Bishop Cc: pgsql-sql@postgresql.org Subject: Re: [SQL] Help writing a piece of SQL Nigel Bishop wrote: > > username | domain | sendto > +-------------+-------------------------------+------------------------- > ----- > > Postmaster | intthit08.uk.rabbit.com | root > root | intthit08.uk.rabbit.com | [EMAIL PROTECTED] > stoat.griffin | trusting.co.uk | [EMAIL PROTECTED] > stoat.griffin | trusting.com | [EMAIL PROTECTED] > stoat.griffin | rusty.co.uk | [EMAIL PROTECTED] > stoat.griffin | rusty.com | [EMAIL PROTECTED] > * | trusting.com | [EMAIL PROTECTED] > * | trusting.co.uk | [EMAIL PROTECTED] > * | rusty.co.uk | [EMAIL PROTECTED] > * | rusty.com | [EMAIL PROTECTED] > The query will have the username and domain passed in as variables. > If the username and domain exist then return the sendto > The bit I'm struggling with is if the username doesn't exist then return > the sendto where the domain exists > > e.g. username=fred (this doesn't exist) and domain=rusty.com then > return [EMAIL PROTECTED], [EMAIL PROTECTED], > [EMAIL PROTECTED] So: if the username doesn't exist then you return ALL rows with a matching domain? Not just username="*"? I'm guessing I've mis-understood and you just want username="*", which would be something like this: SELECT sendto, 1 AS priority FROM tbl WHERE username=$1 AND domain=$2 UNION ALL SELECT sendto, 2 AS priority FROM tbl WHERE username='*' AND domain=$2 ORDER BY priority LIMIT 1; Does that help at all? -- Richard Huxton Archonet Ltd Communications on or through ioko's computer systems may be monitored or recorded to secure effective system operation and for other lawful purposes. Unless otherwise agreed expressly in writing, this communication is to be treated as confidential and the information in it may not be used or disclosed except for the purpose for which it has been sent. If you have reason to believe that you are not the intended recipient of this communication, please contact the sender immediately. No employee is authorised to conclude any binding agreement on behalf of ioko with another party by e-mail without prior express written confirmation. ioko365 Ltd. VAT reg 656 2443 31. Reg no 3048367. All rights reserved. ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
