As we know that CURDATE() only returns the date unit so it would be ambiguous to use INTERVAL of time unit with CURDATE(). MySQL always represents current date with ‘00:00:00’ time hence when we use INTERVAL of time unit with CURDATE() then such kind of time arithmetic would take this time into consideration. Following examples will clarify it −
mysql> Select CURDATE() + INTERVAL 0 hour; +-----------------------------+ | curdate() + Interval 0 hour | +-----------------------------+ | 2017-10-28 00:00:00 | +-----------------------------+ 1 row in set (0.00 sec) mysql> select CURDATE() + INTERVAL 1 hour; +-----------------------------+ | curdate() + Interval 1 hour | +-----------------------------+ | 2017-10-28 01:00:00 | +-----------------------------+ 1 row in set (0.00 sec) mysql> Select CURDATE() + INTERVAL 2 hour; +-----------------------------+ | CURDATE() + INTERVAL 2 hour | +-----------------------------+ | 2017-10-28 02:00:00 | +-----------------------------+ 1 row in set (0.00 sec)