Thanks AD, I did have an nagging suspicion that this would require something like that with temporary tables and things.
What I did for now (until I do some performance testing on it and in case anyone find it useful) was: 1. A deleteAll using a "NOT" condition. Deletes anything that does not match my list of ids. 2. A find(list) of what is left. 3. Loop my list of ids and test each against the ones found in the database using in_array() 4. A saveAll to save any ids that were "new" (not in the array). As you can see quite a few steps but is if reasonable efficient for now. But, a big thank you for the example with the temp table, I suspect it will come in handy quite soon. /Martin On Jan 26, 7:56 pm, AD7six <andydawso...@gmail.com> wrote: > On Jan 26, 2:35 pm, Martin Westin <martin.westin...@gmail.com> wrote: > > > > > Hi, > > I am in need of an unusual query that I find it hard to search for on > > Google or MySQL.com since all the terms I think of are very common > > ones. Hopefully someone reading this can guide me in the right > > direction. > > > I have a series of values in an array. I can find out which records > > have matching values by passing this array as a condition to get a > > "WHERE somefield IN (value1,value2)" clause. > > > I can also find which records have non-matching fields by using a > > "WHERE NOT(...)" clause. Finding the "orphans" in the database so to > > speak. > > > Of-course I want something else. I want to find out which values in my > > array do not match a record in the database. Finding the orphans in my > > array so to speak. I have not figured out how to do this without using > > the IN clause and then comparing the results. Since this is > > "expensive" (looping arrays take time) I really wanted to find an SQL- > > way that would be less expensive. > > > "SELECT VALUES IN MY ARRAY THAT DO NOT FIND ANY MATCHING RECORD" - > > sort of. > > > Any guidance would be appreciated > > /Martin > > There's probably a more elegant way, This'd work: > > DROP TABLE `tmp`; > CREATE TABLE `tmp` ( > `id` INT( 11 ) NULL > ) ENGINE = MEMORY; > INSERT INTO `tmp` ( > `id` > ) > VALUES (1),(2),(3),(4),(5); # The values you want to search for > > select `tmp`.`id` from `mytable` RIGHT JOIN `tmp` on > `mytable`.`somefield` = `tmp`.`id` WHERE `mytable`.`somefiled` IS > NULL; > > Anything returned is a `mytable`.`somefield` that doesn't exist. > > AD --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "CakePHP" group. To post to this group, send email to cake-php@googlegroups.com To unsubscribe from this group, send email to cake-php+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/cake-php?hl=en -~----------~----~----~----~------~----~------~--~---
