Sort data column to retrieve max textual value in MySQL

For this, you can use ORDER BY along with some aggregate function right(). Let us first create a table −

mysql> create table DemoTable1487
   -> (
   -> StudentCode text
   -> );
Query OK, 0 rows affected (0.91 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1487 values('560');
Query OK, 1 row affected (0.36 sec)
mysql> insert into DemoTable1487 values('789');
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable1487 values('STUDENT78');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable1487 values('John89');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable1487 values('Carol101');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable1487 values('STUDENT98');
Query OK, 1 row affected (0.13 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1487;

This will produce the following output −

+-------------+
| StudentCode |
+-------------+
| 560         |
| 789         |
| STUDENT78   |
| John89      |
| Carol101    |
| STUDENT98   |
+-------------+
6 rows in set (0.00 sec)

Here is the query to sort data column to retrieve maximum textual value −

mysql> select * from DemoTable1487 where StudentCode LIKE 'STUDENT%'
   -> order by cast(right(StudentCode,length(StudentCode)-length('STUDENT')) as UNSIGNED) desc
   -> limit 1;

This will produce the following output −

+-------------+
| StudentCode |
+-------------+
| STUDENT98   |
+-------------+
1 row in set (0.04 sec)

AmitDiwan

Published on 11-Dec-2019 09:37:31