Hi: How i obtain inmediatly the id of last insert ? For example i have a forum, when the user post a question, i send a mail to administrator, but i want to refer the id from this insert, how i do this ? Well i think to make a select max(id) inmediatly but i beliebe that must have any colision from other user that post other question.
What database are you using? You may be able to use mysql_insert_id() or "SELECT @@IDENTITY" depending upon your DB...
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