How to add duplicate varchar values without displaying error in MySQL?

For this, let us see an example and first create a −

mysql> create table DemoTable1409
   -> (
   -> FirstName varchar(20),
   -> UNIQUE KEY UN_FirstName(FirstName)
   -> );
Query OK, 0 rows affected (0.79 sec)

Following is the query to add duplicate varchar −

mysql> alter table DemoTable1409 drop index  UN_FirstName;
Query OK, 0 rows affected (0.40 sec)
Records: 0  Duplicates: 0  Warnings: 0

Insert some records in the table using insert −

mysql> insert into DemoTable1409 values('Chris');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1409 values('Chris');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1409 values('David');
Query OK, 1 row affected (0.09 sec)

Display all records from the table using select −

mysql> select * from DemoTable1409;

This will produce the following output −

+-----------+
| FirstName |
+-----------+
| Chris     |
| Chris     |
| David     |
+-----------+
3 rows in set (0.00 sec)