How to add values of the same item in a column?

Question

I have the following columns in a table:

1. Product Name
2. Quantity
3. Description

I want to add the quantities of the product if the name of the product is same. For example if I have product with the same name twice, I want the total quantities of the products to be added and get a result.

This is the table and I want to add the quantities of the same item:

Name            Quantity   Description
Pen              3 
Pencil           2
Pen              6
Eraser           7
Eraser           6

For exmaple:

• I have pen twice and so want to add (3+6) and the display the total as 9, and ...
• I have eraser twice (7+6), so the total should be 13.

Answer 1

The solution is GROUP BY clause:

SELECT Name, SUM(Quantity) 
FROM Table
GROUP BY Name

GROUP BY is used in an SQL query to group rows together for aggregation purposes. For example: If your input table had rows:

ItemName       Qty
Pen            4
Pencil         7
Pen            6

SQL Code:

SELECT ItemName, SUM(Qty) 
FROM Table
GROUP BY ItemName

Using GROUP BY ItemName in your query would give you the output:

ItemName       Qty
Pen            10
Pencil         7