TIMESTAMP data types and CURRENT_TIMESTAMP attribute
In the yet to be released MySQL 5.6.6 DMR, there has been a change to the restriction of just one TIMESTAMP column with the DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP syntax. It is now possible for any TIMESTAMP to have either column defintion.
More information at http://dev.mysql.com/doc/refman/5.6/en/news-5-6-5.html
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