Ответ: Добавить запись если не существует.
http://dev.mysql.com/doc/refman/5.0/...duplicate.html
Например:
INSERT INTO users
SET
`id` = 1,
`name` = "ololosha",
`pass` ="somepass"
ON DUPLICATE KEY UPDATE
`name` = "ololosha",
`pass` = "somepass"
id - PRIMARY KEY (или UNIQUE)
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