MySQL query to SELECT rows with LIKE and create new column containing the matched string?

For this, use SUBSTRING(). Let us first create a table −

mysql> create table DemoTable1872
   (
   Name varchar(20)
   );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1872 values('John Doe');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1872 values('Adam Smith');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1872 values('Mitchell Johnson');
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1872;

This will produce the following output −

+------------------+
| Name             |
+------------------+
| John Doe         |
| Adam Smith       |
| Mitchell Johnson |
+------------------+
3 rows in set (0.00 sec)

Following is the query to select rows with LIKE and create new column containing the matched string −

mysql> select Name,
   substring(Name, locate('John', Name), length('John')) as NewName
   from DemoTable1872
   where Name like '%John%';

This will produce the following output −

+------------------+---------+
| Name             | NewName |
+------------------+---------+
| John Doe         | John    |
| Mitchell Johnson | John    |
+------------------+---------+
2 rows in set (0.00 sec)