Performing mathematical operations in MySQL IF then ELSE is possible?

For performing mathematical operations and working with conditions, you can consider CASE statement. Let us first create a table −

mysql> create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   FruitName varchar(100),
   FruitPrice int
   );
Query OK, 0 rows affected (0.26 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(FruitName,FruitPrice) values('Orange',250);
Query OK, 1 row affected (0.10 sec)

mysql> insert into DemoTable(FruitName,FruitPrice) values('Banana',100);
Query OK, 1 row affected (0.05 sec)

mysql> insert into DemoTable(FruitName,FruitPrice) values('Apple',150);
Query OK, 1 row affected (0.05 sec)

mysql> insert into DemoTable(FruitName,FruitPrice) values('Pomegranate',200);
Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+----+-------------+------------+
| Id | FruitName   | FruitPrice |
+----+-------------+------------+
|  1 | Orange      |        250 |
|  2 | Banana      |        100 |
|  3 | Apple       |        150 |
|  4 | Pomegranate |        200 |
+----+-------------+------------+
4 rows in set (0.19 sec)

Following is the query for CASE statement with mathematical operations −

mysql> select Id,FruitName,FruitPrice,
   case
   when FruitName='Orange'
   then FruitPrice/5
   else FruitPrice
   end as OriginalPrice
   from DemoTable;

This will produce the following output −

+----+-------------+------------+---------------+
| Id | FruitName   | FruitPrice | OriginalPrice |
+----+-------------+------------+---------------+
|  1 | Orange      |        250 |       50.0000 |
|  2 | Banana      |        100 |           100 |
|  3 | Apple       |        150 |           150 |
|  4 | Pomegranate |        200 |           200 |
+----+-------------+------------+---------------+
4 rows in set (0.00 sec)