Decomposing Dates or Times Using String Functions substrings. : Date Function « Date Time « SQL / MySQL

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

Decomposing Dates or Times Using String Functions substrings.

     
mysql>
mysql>
mysql> CREATE TABLE datetime_val
    -> (
    ->  dt      DATETIME
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql>
mysql> INSERT INTO datetime_val (dt) VALUES('1970-01-01 00:00:00');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO datetime_val (dt) VALUES('1987-03-05 12:30:15');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO datetime_val (dt) VALUES('1999-12-31 09:00:00');
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO datetime_val (dt) VALUES('2000-06-04 15:45:30');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT * FROM datetime_val;
+---------------------+
| dt                  |
+---------------------+
| 1970-01-01 00:00:00 |
| 1987-03-05 12:30:15 |
| 1999-12-31 09:00:00 |
| 2000-06-04 15:45:30 |
+---------------------+
4 rows in set (0.00 sec)

mysql>
mysql>
mysql> SELECT dt,
    -> LEFT(dt,4) AS year,
    -> MID(dt,9,2) AS day,
    -> RIGHT(dt,2) AS second
    -> FROM datetime_val;
+---------------------+------+------+--------+
| dt                  | year | day  | second |
+---------------------+------+------+--------+
| 1970-01-01 00:00:00 | 1970 | 01   | 00     |
| 1987-03-05 12:30:15 | 1987 | 05   | 15     |
| 1999-12-31 09:00:00 | 1999 | 31   | 00     |
| 2000-06-04 15:45:30 | 2000 | 04   | 30     |
+---------------------+------+------+--------+
4 rows in set (0.00 sec)

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

   
    
    
    
    
  

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