DJ <[EMAIL PROTECTED]> wrote on 09/23/2005 12:49:35 PM: > [EMAIL PROTECTED] wrote: > > >DJ wrote on 09/23/2005 12:22:58 PM: > > > > > >>i want to insert a row into table1 only if the value being inserted on
> >>table1 exists on table2 primary id. > >> > >>can i do this with subquery? > >> > >>thanx. > >> > >> > >> > > > >Depending on what version MySQL you are using, probably not. A very robust > >method of doing what you propose is to allow MySQL to do it for you by > >establishing a Foreign Key from table1 to table2. One drawback is that > >both tables need to be InnoDB (which you may not want to support). > > > >What version are you using and what is the possibility of using InnoDB > >with your appliation? > > > >Shawn Green > >Database Administrator > >Unimin Corporation - Spruce Pine > > > >PS: always CC the list on all responses (unless you intentionally mean to > >take the conversation off-list) > > > > > i am using 4.1.x > hmm.. maybe it's easier if i just check the id is in table2 before > inserting into table1. > not really a big deal just looking to create shortcuts without running > multiple queries.. > > With a foreign key defined, you only need to run one query. That's why I mentioned it. ;-) Your way works, too. Shawn Green Database Administrator Unimin Corporation - Spruce Pine
