We can add ‘half year interval’ in date ith the following ways −
(A) By adding interval of 6 Months
mysql> Select '2017-06-20' + INTERVAL 6 Month AS 'After Half Year Interval'; +--------------------------+ | After Half Year Interval | +--------------------------+ | 2017-12-20 | +--------------------------+ 1 row in set (0.00 sec)
(B) By adding interval of 2 quarters
mysql> Select '2017-06-20' + INTERVAL 2 Quarter AS 'After Half Year Interval'; +--------------------------+ | After Half Year Interval | +--------------------------+ | 2017-12-20 | +--------------------------+ 1 row in set (0.00 sec)
Above query will add half year interval in date with the help of Quarter keyword.