Insert Date Record to the Same Table with Different Date Formats in MySQL

For this, you can use the INSERT INTO SELECT statement. To format the date, use the DATE_FORMAT() function. Let us first create a table −

mysql> create table DemoTable
   -> (
   -> DateOfJoining datetime,
   -> JoiningDate text
   -> );
Query OK, 0 rows affected (0.79 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(DateOfJoining) values('2019-10-26 13:52:10');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(DateOfJoining) values('2018-12-31 15:20:40');
Query OK, 1 row affected (0.16 sec)

Display all records from the table using select statement−

mysql> select *from DemoTable;

This will produce the following output −

+---------------------+-------------+
| DateOfJoining       | JoiningDate |
+---------------------+-------------+
| 2019-10-26 13:52:10 | NULL        |
| 2018-12-31 15:20:40 | NULL        |
+---------------------+-------------+
2 rows in set (0.00 sec)

Here is the query to insert date record to the same table with different date formats −

mysql> insert into DemoTable(JoiningDate) select date_format(DateOfJoining , '%W %e, %b %Y @ %r') from DemoTable;
Query OK, 2 rows affected (0.13 sec)
Records: 2 Duplicates: 0 Warnings: 0

Let us check the table records once again−

mysql> select *from DemoTable;

This will produce the following output−

+---------------------+-------------------------------------+
| DateOfJoining       | JoiningDate                         |
+---------------------+-------------------------------------+
| 2019-10-26 13:52:10 | NULL                                |
| 2018-12-31 15:20:40 | NULL                                |
| NULL                | Saturday 26, Oct 2019 @ 01:52:10 PM |
| NULL                | Monday 31, Dec 2018 @ 03:20:40 PM |
+---------------------+-------------------------------------+
4 rows in set (0.00 sec)