Basic SQL Select statement - How Do I find the Sum?

Question

I want to find the sum and count of specific values in my table.

In my specific situation, the table is called product . The column names for the table are 'id , product_id , quantity and shipping_price .

The table contains: (Based on SELECT * FROM product; )

product_id:1    quantity:1     end_price:15     shipping_price:1
product_id:2    quantity:2     end_price:15     shipping_price:0
product_id:1    quantity:1     end_price:15     shipping_price:1
product_id:2    quantity:1     end_price:15     shipping_price:0
product_id:1    quantity:1     end_price:15     shipping_price:1
product_id:3    quantity:1     end_price:15     shipping_price:0

I need a SQL statement which will select the amount of rows with the same product_id , get the sum of the quantity , end_price and shipping_price .

For this example I want the SQL statement to returns, for item 1:

product_id:1    quantity:3    end_price:45    shipping_price:3

Answer 1

You can use the SUM aggregate function, grouping your results by product_id .

SELECT  product_id,
        SUM(quantity) quantity,
        SUM(end_price) end_price,
        SUM(shipping_price) shipping_price
FROM    product
GROUP BY product_id

Answer 2

SELECT product_id, SUM(quantity), SUM(end_price), SUM(shipping_price) FROM product GROUP BY product_id;

Answer 3

SELECT product_id, sum(quantity), sum(end_price), sum(shipping_price) FROM product
group by product_id