How to display highest value from a string with numbers set as varchar in MySQL?

For this, you need to cast the varchar value to INTEGER.

Let us first create a table −

mysql> create table DemoTable765 (ItemPrice varchar(200));
Query OK, 0 rows affected (0.52 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable765 values('567.00');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable765 values('1089.00');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable765 values('540.00');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable765 values('788.00');
Query OK, 1 row affected (0.39 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable765;

This will produce the following output -

+-----------+
| ItemPrice |
+-----------+
| 567.00    |
| 1089.00   |
| 540.00    |
| 788.00    |
+-----------+
4 rows in set (0.00 sec)

Following is the query to display highest value from a string with numbers. We have used CAST() to cast it to INTEGER −

mysql> select *from DemoTable765 order by cast(ItemPrice AS SIGNED INTEGER) DESC;

This will produce the following output -

+-----------+
| ItemPrice |
+-----------+
| 1089.00   |
| 788.00    |
| 567.00    |
| 540.00    |
+-----------+
4 rows in set, 4 warnings (0.00 sec)