Synthesizing Dates or Times Using Component-Extraction Functions : DATE « Date Time « SQL / MySQL






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

Synthesizing Dates or Times Using Component-Extraction Functions

     
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,
    -> CONCAT(YEAR(d),'-',MONTH(d),'-01')
    -> FROM date_val;
+------------+------------------------------------+
| d          | CONCAT(YEAR(d),'-',MONTH(d),'-01') |
+------------+------------------------------------+
| 1864-02-28 | 1864-2-01                          |
| 1900-01-15 | 1900-1-01                          |
| 1987-03-05 | 1987-3-01                          |
| 1999-12-31 | 1999-12-01                         |
| 2000-06-04 | 2000-6-01                          |
+------------+------------------------------------+
5 rows in set (0.00 sec)

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








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1.Extract just the date: DATE()
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5.Date-Based Summaries
6.Add an incorrect date to a special table and show the result.