MySQL query to sum the Product Price values from similar columns for same customers and display the result in the same column

For this, use SUM() along with GROUP BY. Let us first create a table −

mysql> create table DemoTable
(
   CustomerName varchar(100),
   Product_1_Price int,
   Product_2_Price int
);
Query OK, 0 rows affected (0.73 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('John',67,89);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('David',769,890);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('David',987,1000);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('John',900,111);
Query OK, 1 row affected (0.12 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+--------------+-----------------+-----------------+
| CustomerName | Product_1_Price | Product_2_Price |
+--------------+-----------------+-----------------+
| John         |              67 |              89 |
| David        |             769 |             890 |
| David        |             987 |            1000 |
| John         |             900 |             111 |
+--------------+-----------------+-----------------+
4 rows in set (0.00 sec)

Following is the query to SUM the values and display the result for the same customers −

mysql> select CustomerName,SUM(Product_1_Price) AS Total1,SUM(Product_2_Price) As Total2 from DemoTable group by CustomerName;

This will produce the following output −

+--------------+--------+--------+
| CustomerName | Total1 | Total2 |
+--------------+--------+--------+
| John         |    967 |    200 |
| David        |   1756 |   1890 |
+--------------+--------+--------+
2 rows in set (0.00 sec)