How can a query multiply two cells for each row in MySQL?

You can use multiplication operator (*) between two cells. The syntax is as follows
SELECT yourColumnName1,yourColumnName2,
yourColumnName1*yourColumnName2 as ‘anyVariableName’
from yourTableName;
To understand the above syntax, let us create a table. The query to create a table is as follows
mysql> create table MultiplicationDemo
-> (
-> FirstPrice int,
-> SecondPrice int
-> );
Query OK, 0 rows affected (0.63 sec)
Now you can display all records from the table using insert command. The query is as follows
mysql> insert into MultiplicationDemo values(10,2);
Query OK, 1 row affected (0.17 sec)
mysql> insert into MultiplicationDemo values(4,2);
Query OK, 1 row affected (0.30 sec)
mysql> insert into MultiplicationDemo values(5,6);
Query OK, 1 row affected (0.17 sec)
mysql> insert into MultiplicationDemo values(6,3);
Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement. The query is as follows
mysql> select *from MultiplicationDemo;
The following is the output
+————+————-+
| FirstPrice | SecondPrice |
+————+————-+
| 10 | 2 |
| 4 | 2 |
| 5 | 6 |
| 6 | 3 |
+————+————-+
4 rows in set (0.00 sec)
Here is the query to multiply 2 cells
mysql> select FirstPrice,SecondPrice,
-> FirstPrice*SecondPrice as ‘MultiplicationResult’
-> from MultiplicationDemo;
The following is the output
+————+————-+———————-+
| FirstPrice | SecondPrice | MultiplicationResult |
+————+————-+———————-+
| 10 | 2 | 20 |
| 4 | 2 | 8 |
| 5 | 6 | 30 |
| 6 | 3 | 18 |
+————+————-+———————-+
4 rows in set (0.03 sec)