Get digits from a record in MySQL?

Use the function CONVERT() or Regular Expression. The CONVERT() method converts a value from one datatype to another. This will ecnetually fetch digits for us. Let us see an example.

Firstly, we will create a table.

mysql> create table textIntoNumberDemo
   -> (
   -> Name varchar(100)
   -> );
Query OK, 0 rows affected (0.47 sec)

Inserting some records.

mysql> insert into textIntoNumberDemo values('John-11');
Query OK, 1 row affected (0.11 sec)

mysql> insert into textIntoNumberDemo values('John-12');
Query OK, 1 row affected (0.17 sec)

mysql> insert into textIntoNumberDemo values('John-2');
Query OK, 1 row affected (0.11 sec)

mysql> insert into textIntoNumberDemo values('John-4');
Query OK, 1 row affected (0.14 sec)

To display all records.

mysql> select *from textIntoNumberDemo;

Here is the output.

+---------+
| Name    |
+---------+
| John-11 |
| John-12 |
| John-2  |
| John-4  |
+---------+
4 rows in set (0.00 sec)

Syntax to fetch digit.

SELECT yourColumnName,CONVERT(SUBSTRING_INDEX(yourColumnName,'-',-1),UNSIGNED INTEGER) AS  yourVariableName
FROM yourTableName
order by yourVariableName;

The following is the query.

mysql> SELECT Name,CONVERT(SUBSTRING_INDEX(Name,'-',-1),UNSIGNED INTEGER) AS MyNumber
   -> FROM textIntoNumberDemo
   -> order by MyNumber;

Here is the output.

+---------+----------+
| Name    | MyNumber |
+---------+----------+
| John-2  |        2 |
| John-4  |        4 |
| John-11 |       11 |
| John-12 |       12 |
+---------+----------+
4 rows in set (0.00 sec)