DATE_CMP Function
DATE_CMP compares two dates. The function returns 0
if the dates are
identical, 1
if date1 is greater, and -1
if
date2 is greater.
Syntax
DATE_CMP(date1, date2)
Arguments
- date1
-
A date column or an expression that implicitly converts to a date.
- date2
-
A date column or an expression that implicitly converts to a date.
Return Type
INTEGER
Example
The following query compares the CALDATE column to the date January 4, 2008 and
returns whether the value in CALDATE is before (-1
), equal to
(0
), or after (1
) January 4, 2008:
select caldate, '2008-01-04', date_cmp(caldate,'2008-01-04') from date order by dateid limit 10; caldate | ?column? | date_cmp -----------+------------+---------- 2008-01-01 | 2008-01-04 | -1 2008-01-02 | 2008-01-04 | -1 2008-01-03 | 2008-01-04 | -1 2008-01-04 | 2008-01-04 | 0 2008-01-05 | 2008-01-04 | 1 2008-01-06 | 2008-01-04 | 1 2008-01-07 | 2008-01-04 | 1 2008-01-08 | 2008-01-04 | 1 2008-01-09 | 2008-01-04 | 1 2008-01-10 | 2008-01-04 | 1 (10 rows)