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)
Published on 09-Oct-2019 16:08:31
