Exemple DATEDIFF
DATEDIFF
DATEDIFF (HOUR FROM CURRENT_TIMESTAMP TO TIMESTAMP '12-JUN-2059 06:00')
DATEDIFF (MINUTE FROM TIME '0:00' TO CURRENT_TIME)
DATEDIFF (MONTH, CURRENT_DATE, DATE '1-1-1900')
DATEDIFF (DAY FROM CURRENT_DATE TO CAST (? AS DATE))