Finding the minimum and maximum value from a string with numbers separated by hyphen in MySQL?

Use MIN() function along with SUBSTRING() for minimum, whereas MAX() for maximum. Let us first create a table −

mysql> create table DemoTable
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> Value varchar(100)
   -> );
Query OK, 0 rows affected (0.76 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(Value) values('10-20');
Query OK, 1 row affected (0.18 sec)

mysql> insert into DemoTable(Value) values('200-100');
Query OK, 1 row affected (0.13 sec)

mysql> insert into DemoTable(Value) values('780-235');
Query OK, 1 row affected (0.29 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+----+---------+
| Id | Value   |
+----+---------+
| 1 | 10-20    |
| 2 | 200-100  |
| 3 | 780-235  |
+----+---------+
3 rows in set (0.00 sec)

Following is the query to find the MIN() and MAX() value from the number substrings separated from a string with hyphen −

mysql> select min(SUBSTRING_INDEX(Value, '-', 1)),
   -> max(SUBSTRING_INDEX(Value, '-', -1))
   -> from DemoTable;

This will produce the following output −

+-------------------------------------+--------------------------------------+
| min(SUBSTRING_INDEX(Value, '-', 1)) | max(SUBSTRING_INDEX(Value, '-', -1)) |
+-------------------------------------+--------------------------------------+
| 10                                  | 235                                  |
+-------------------------------------+--------------------------------------+
1 row in set (0.04 sec)