DATEDIFF(t,s)

DATEDIFF(t,s) is a date function that calculates the number of days between a start and end date.

t and s values: When used in a function, the expressions t and s (date_or_timestamp_expression) must supply a date, a time stamp, or an alphanumeric value that matches the current date or time stamp format.

DATEDIFF(t,s)
t, s	Result of DATEDIFF(t,s) Function
Positive difference between t and s	Numeric value (number of days)
t or s are time stamp values	Only the dates in the time stamp value are used to calculate DATEDIFF(t,s).
t or s is a NULL value	NULL value

Example Example

SELECT arrival, departure, DATEDIFF(departure,arrival) difference, rno

FROM reservation

WHERE rno = 130

ARRIVAL	DEPARTURE	DIFFERENCE	RNO
2005-02-01	2005-02-03	2	130

End of the example.