Sub-selects are supported in v4.1, which is still in Alpha release. Edward Dudlik Becoming Digital www.becomingdigital.com
----- Original Message ----- From: "Petre Agenbag" <[EMAIL PROTECTED]> To: "Egor Egorov" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Thursday, 05 June, 2003 06:18 Subject: Re: Getting the row back with the highest ID. Thanks, I presume that subselects is not yet featured in MySQL 4.0.13? ( Sorry, can prolly get this by RTFM ), If it does, how would the query look? Thanks On Thu, 2003-06-05 at 11:44, Egor Egorov wrote: > Petre Agenbag <[EMAIL PROTECTED]> wrote: > > > > I think I'm having a very off day and need some confirmations on how > > MySQL works with it's result sets. > > > > I have a couple of relational tables , the first holding the person's > > name and address for instance, and the other tables holds comments and > > complaints respectively. Each table has it's own id field, as well as a > > "master_id" that equals the id of the "main" table. > > > > The app that I'm writing (in PHP), lists the users with a simple "select > > * from main" , and this returns all the users currently on the system ( > > I have names as varchar and unique). > > > > My problem is now with the following: > > > > When the user clicks on one of the names, I want to do a couple of > > things: > > > > a) The user details be displayed along with all the comments and > > complaints that correspond to that users id located in the other tables. > > pseudo SQL -> "select * from comments where (place_holder id in > > comments) = (id in main table)"; > > b) Being able to list the comments and complaints in reverse order ie, > > older ones first: > > pseudo SQL -> "select * from comments where (place_holder id) = (id in > > main table) order by id desc"; > > c) List ONLY the last (newest) comments/complaints > > THIS IS WHERE I have problems: > > > > If I do a "select MAX(id), comment from comments where (place_holder id) > > = (id in main table)" will MySQL automagically grab the comment from the > > row that has the maximum ID? If so, is there a shorter way of doing this > > query? For my example here, it's not a big deal, but with larger tables > > with more collumns, having to specify the collumns in the query ( when I > > want ALL to be returned) becomes a bit of a hassle.. > > > > Nope. MySQL will return fist found comment. > > > I basically want to say: > > > > return ONLY the last comment added where the id matches the supplied id > > from main_table. > > > > So, I need to Translate this to SQL... > > > > Can I do this with SQL, or must I first establish the id with the > > "select MAX(id) from comments where id = provided_id", and then do a new > > query " select * from comments where id = MAX(id) " > > Without subselects you need 2 queries. > > > > -- > For technical support contracts, goto https://order.mysql.com/?ref=ensita > This email is sponsored by Ensita.net http://www.ensita.net/ > __ ___ ___ ____ __ > / |/ /_ __/ __/ __ \/ / Egor Egorov > / /|_/ / // /\ \/ /_/ / /__ [EMAIL PROTECTED] > /_/ /_/\_, /___/\___\_\___/ MySQL AB / Ensita.net > <___/ www.mysql.com > > > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
