TIMESTAMPDIFF
Returns the difference between two DATE or DATETIME in a specific unit of measurement
TIMESTAMPDIFF(unit, datetime1, datetime2)
unitThe unit of measurement in which to return the difference between the values.
datetime1The value to be subtracted from datetime2
datetime2The value from which datetime1 will be subtracted
Examples
SELECT TIMESTAMPDIFF(YEAR, '2012-06-12', '2022-12-05');
SELECT TIMESTAMPDIFF(DAY, '2022-06-12', '2022-12-05');