SQL

date diff sql

SELECT DATEDIFF(year, '2017/08/25', '2011/08/25') AS DateDiff;

sql date diff

SELECT DATEDIFF('2022-04-08',Date('2022-04-06 20:23:08')) as days,
TO_DAYS('2022-04-08') - TO_DAYS(date('2022-04-06 20:23:08')) as todays

//hours
SELECT TIMESTAMPDIFF(HOUR,NOW(),'2013-05-15 10:23:23')
   calculates difference in hour.(for days--> you have to define day replacing hour