Finding the Length of a Month : DATE_SUB « Date Time « SQL / MySQL






  1. SQL / MySQL
  2. Date Time
  3. DATE_SUB

Finding the Length of a Month

      
mysql>
mysql> CREATE TABLE date_val
    -> (
    ->  d       DATE
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql>
mysql> INSERT INTO date_val (d) VALUES('1864-02-28');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO date_val (d) VALUES('1900-01-15');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO date_val (d) VALUES('1987-03-05');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO date_val (d) VALUES('1999-12-31');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO date_val (d) VALUES('2000-06-04');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT d,
    -> DAYOFMONTH(DATE_SUB(
    -> DATE_ADD(DATE_SUB(d,INTERVAL DAYOFMONTH(d)-1 DAY),INTERVAL 1 MONTH),
    -> INTERVAL 1 DAY))
    -> AS 'days in month'
    -> FROM date_val;
+------------+---------------+
| d          | days in month |
+------------+---------------+
| 1864-02-28 |            29 |
| 1900-01-15 |            31 |
| 1987-03-05 |            31 |
| 1999-12-31 |            31 |
| 2000-06-04 |            30 |
+------------+---------------+
5 rows in set (0.00 sec)

mysql>
mysql> drop table date_val;
Query OK, 0 rows affected (0.00 sec)








Related examples in the same category

1.Find the date a week ago
2.Calculated dates are useful for range testing
3.Calculate the last day of the month for the previous, current, and following months relative to a given date,
4.Finding First and Last Days of Months
5.The last day of the previous month is a special case for which the general expression can be simplified quite