Compound INTERVAL unit keywords are made up of two keywords and separated by an underscore (_). For using them in MySQL the unit values must be enclosed in single quotes and separated by space.
Example − Following query will add 2 years and 2 months in the date value.
mysql> Select timestamp('2017-10-22 04:05:36' + INTERVAL '2 2' year_month) AS'Date After 2 Years and 2 Months'; +---------------------------------+ | Date After 2 Years and 2 Months | +---------------------------------+ | 2019-12-22 04:05:36 | +---------------------------------+ 1 row in set (0.00 sec)