MySQL query to update all the values in a column with numeric incremental values like John1, John2, John3, etc.

To update all the values in a column to John1, John2, etc.; you need to set incremental values 1, 2, 3, etc. and concatenate them to the records. Let us first create a table −

mysql> create table DemoTable
(
   StudentId varchar(80)
);
Query OK, 0 rows affected (0.50 sec)

Insert some records in the table using insert command. Here, for our example, we have set similar names −

mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.08 sec)
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.07 sec)
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.08 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+
| StudentId |
+-----------+
|      John |
|      John |
|      John |
|      John |
|      John |
+-----------+
5 rows in set (0.00 sec)

Following is the query to update/concatenate all names with numeric incremental values −

mysql> update DemoTable,(select @row := 0) r set StudentId =concat('John',@row := @row+ 1);
Query OK, 5 rows affected (0.11 sec)
Rows matched: 5 Changed: 5 Warnings: 0

Let us check the table records once again −

mysql> select *from DemoTable;

This will produce the following output −

+-----------+
| StudentId |
+-----------+
|     John1 |
|     John2 |
|     John3 |
|     John4 |
|     John5 |
+-----------+
5 rows in set (0.00 sec)