Mega Code Archive
Performing Leap Year Calculations
<![CDATA[
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>
mysql> SELECT d, YEAR(d) % 4 = 0
-> AS "rule-of-thumb test",
-> (YEAR(d) % 4 = 0) AND ((YEAR(d) % 100 != 0) OR (YEAR(d) % 400 = 0))
-> AS "complete test"
-> FROM date_val;
+------------+--------------------+---------------+
| d | rule-of-thumb test | complete test |
+------------+--------------------+---------------+
| 1864-02-28 | 1 | 1 |
| 1900-01-15 | 1 | 0 |
| 1987-03-05 | 0 | 0 |
| 1999-12-31 | 0 | 0 |
| 2000-06-04 | 1 | 1 |
+------------+--------------------+---------------+
5 rows in set (0.00 sec)
mysql>
mysql> drop table date_val;
Query OK, 0 rows affected (0.00 sec)
mysql>
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