CHECKSUM TABLE returns a checksum
that is calculated row by row, using a method that depends on
the table row storage format, which is not guaranteed to remain
the same between MySQL release series. For example, the storage
format for temporal types such as
TIMESTAMP changed in MySQL 5.6
prior to MySQL 5.6.5, so if a 5.5 table is upgraded to MySQL
5.6, the checksum value may change.