Recurso interessante e muito util do MySQL que até então eu desconhecia.
SQL:
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INSERT INTO Sales(TransId, STATUS, Amount)
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VALUES(123, ‘Pending’, 20)
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ON DUPLICATE KEY UPDATE STATUS = ‘Paid’
Fonte:
http://thingsilearn.wordpress.com/2007/10/29/mysql-insert-or-update-in-one-query/
http://particletree.com/notebook/to-insert-or-to-update/
http://dev.mysql.com/doc/refman/5.1/en/insert-on-duplicate.html
