Instead of "insert into" you can use "replace into". -- João Cândido de Souza Neto
"Andre Polykanine" <an...@oire.org> escreveu na mensagem news:1621362474.20110214201...@oire.org... Hi all, Thanks for your fast answer to my last question! Here's one more problem I commonly deal with. There are cases when I need to insert the row only if such a row doesn't exist, otherwise I need either to update the row or to do nothing, just skip the query. The common case is the rating increment/decrement. I have the + and - links which are AJAX. So I need to prevent fast multiple clicking and over-increasing or over-decreasing the rating of the blog entry. Here's what I'm doing, in a simplified form (assume all of the numbers are PHP variables): "SELECT `Id` FROM `Votes` WHERE `EntryId`='12345' AND `UserId`='789'"; then I'm checking if the user has already clicked a link: if (mysql_num_rows()==0) { "INSERT INTO `Votes` SET `EntryId`='12345', `UserId`='789'"; } else { // do nothing } And here is the question (at last!): How can I MySql'ly check whether a vote does exist and if it does, then insert the row, else either do nothing or update several columns? I assume I can't use ON DUPLICATE KEY UPDATE because I have no unique keys... Hope you understood my problem). Thanks! -- With best regards from Ukraine, Andre Skype: Francophile Twitter: http://twitter.com/m_elensule Facebook: http://facebook.com/menelion -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
