Multiple references to a function such as NOW() within a single query always produce the same result
mysql> This principle also applies to CURDATE(), CURTIME(), UTC_DATE(), UTC_TIME(), UTC_TIMESTAMP(), and to any of their synonyms. mysql> mysql> select now(), now(); +---------------------+---------------------+ | now() | now() | +---------------------+---------------------+ | 2007-07-22 19:46:01 | 2007-07-22 19:46:01 | +---------------------+---------------------+ 1 row in set (0.00 sec)
mysql>
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