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    <p>If you want to update a field that is already exist, you can do this as;</p> <pre> -- MySQL Reference INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6) ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b); -- so your code INSERT INTO users (email, name) VALUES ('" .$epost. "', '" .$namn. "') ON DUPLICATE KEY UPDATE email=VALUES(email), name=VALUES(name) </pre> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html" rel="nofollow">http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html</a></p> <p><strong>UPDATE</strong></p> <p>At this point, you need "MySQL conditional insert". Let's try it;</p> <pre> CREATE TABLE IF NOT EXISTS `users` ( `name` varchar(50) NOT NULL, `email` varchar(255) NOT NULL, UNIQUE KEY `email` (`email`) ) INSERT INTO users (name, email) VALUES('kerem', 'qeremy[atta]gmail[dotta]com'); INSERT INTO users (name, email) VALUES('test', 'test@example.com'); >> 2 rows inserted. ( Query took 0.0005 sec ) -- this is your part (regarding email field is UNIQUE, so WHERE email='search email') INSERT INTO users (name, email) SELECT 'test', 'test@example.com' FROM DUAL WHERE NOT EXISTS ( SELECT * FROM users WHERE email = 'test@example.com' LIMIT 1 ); >> 0 rows inserted. ( Query took 0.0003 sec ) </pre> <p><a href="https://www.google.com/search?q=conditional+insert+mysql" rel="nofollow">https://www.google.com/search?q=conditional+insert+mysql</a></p> <p><a href="http://allurcode.com/2011/04/15/mysql-conditional-insert/" rel="nofollow">http://allurcode.com/2011/04/15/mysql-conditional-insert/</a> (which is useful search result)</p> <p><strong>UPDATE 2</strong></p> <p>If this does not work for you, then you can do your work like (just an input);</p> <pre> mysql_query("INSERT IGNORE INTO users (name, email) VALUES('$name', '$email')"); if (!mysql_insert_id()) { mysql_query("UPDATE users SET name='$name' WHERE name='' AND email='$email'"); } Or; mysql_query("UPDATE users SET name='$name' WHERE name='' AND email='$email'"); if (mysql_affected_rows() &lt; 1) { mysql_query("INSERT INTO users (name, email) VALUES('$name', '$email')"); } </pre>
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    1. COI'm trying to do something like this: INSERT INTO users (email, name) VALUES ('" .$epost. "', '" .$namn. "') ON DUPLICATE KEY UPDATE name=VALUES(name) if name == ''
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    2. CO`on duplicate` statement works only unique or primary key defined. Which is unique or primary?
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    3. COid is unique and primary, email is unique
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