Ok, you must have your own reasons to do that. The fact is: You can´t set the auto_incremente value field to another field in the same table and record even in a trigger.
So, the best way is a second update. -- João Cândido de Souza Neto "Darryle Steplight" <dstepli...@gmail.com> escreveu na mensagem news:AANLkTim+fjYUoU+1A5RG9eFS+NnaZXT7K+Ho-q=f-...@mail.gmail.com... @Joao - I'm currently building a database out right now that has this scenario. One field can be the primary key, that has a purpose for holding the record id, another field can hold the value. Let say there are two fields, id, s_id. Initially, you insert a record and `id` is now 100 and you update s_id to be 100. But for whatever reason, later down the road you need s_id to be 200. You can just update the s_id field instead of deleting the entire record and inserting an entire new one with X amount of fields. Updating one field is a lot less work than deleting and inserting. I have my tables set up so I won't have to use the primary key for queries, I will only use the s_id field. 2011/1/21 João Cândido de Souza Neto <j...@consultorweb.cnt.br> > I can´t think about how useful for you would be to have two fields with > the > same value. > > -- > João Cândido de Souza Neto > > ""Jerry Schwartz"" <je...@gii.co.jp> escreveu na mensagem > news:007501cbb98a$177acba0$467062e0$@co.jp... > Here it is in a nutshell: > > > > I have a field that needs to be set equal to the auto-increment ID as a > record is entered. I don't know how to do this without a subsequent UPDATE > (which I can do with a trigger). Is there any way to avoid the cost of an > UPDATE? > > > > Here's a more concrete description of the problem: > > > > CREATE TABLE t ( > > id INT(11) AUTO-INCREMENT PRIMARY, > > xxx INT(11) > > ); > > > > When a record is added to table `t`, I need to set `xxx` to the value > generated for `id`. (`xxx` might be changed later.) > > > > Is there anything clever I can do? > > > > Regards, > > > > Jerry Schwartz > > Global Information Incorporated > > 195 Farmington Ave. > > Farmington, CT 06032 > > > > 860.674.8796 / FAX: 860.674.8341 > > E-mail: <mailto:je...@gii.co.jp> je...@gii.co.jp > > Web site: <http://www.the-infoshop.com/> www.the-infoshop.com > > > > > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/mysql?unsub=dstepli...@gmail.com > > -- ---------------------------------------------- "May the Source be with you." -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
