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\!h YEAR -- for storing only year values
YEAR[(digits)] 
-- Stores a two- or four-digit year, depending on which is input as the digits parameter(without parameter, 4 is default).
-- Two-digit version stores values from  70 to 69, meaning 1970 to 2069.
-- Four-digit version stores values from 1901 to 2155, including the zero year 0000.
-- Illegal values default to the zero year.
-- Can be stored as strings('2018') or integers(2018).

\!h DATETIME -- Stores and displays a date and time pair
-- Format of YYYY-MM-DD HH:MM:SS for the range 1000-01-01 00:00:00 to 9999-12-31 23:59:59.
-- No date input = zero date 0000-00-00 assumed.
-- No time input = zero time 00:00:00 assumed.
-- No automatic aupdate features of TIMESTAMP.