MySQL query to group rows by the numeric characters in a string field?

Fir this, you can concatenate 0 with string field with the help of + operator. The scenario here is like we need to fetch numeric “9844” from a string field “9844Bob”.

Let us first create a table −

mysql> create table DemoTable
(
   StudentId varchar(100)
);
Query OK, 0 rows affected (0.92 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('9844Bob');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values('6375DavidMiller');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('007');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values('97474BobBrown');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values('9844Bob56Taylor');
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 −

+-----------------+
| StudentId       |
+-----------------+
| 9844Bob         |
| 6375DavidMiller |
| 007             |
| 97474BobBrown   |
| 9844Bob56Taylor |
+-----------------+
5 rows in set (0.00 sec)

Following is the query to group rows by the numeric characters in a string field −

mysql> select StudentId,0+StudentId as GroupValue from DemoTable;

This will produce the following output −

+-----------------+------------+
| StudentId       | GroupValue |
+-----------------+------------+
| 9844Bob         |       9844 |
| 6375DavidMiller |       6375 |
| 007             |          7 |
| 97474BobBrown   |      97474 |
| 9844Bob56Taylor |       9844 |
+-----------------+------------+
5 rows in set, 4 warnings (0.00 sec)