MYSQL SUM或两列匹配时合并一列

Question

I tried and tried but I am just not getting it.

What I am try to do is this. I have one table and when there are matching productCode's with matching productPrice's, I need the results to combine the matching productCodes, sum the productUnits of the matching productCode's then multiply them by the productPrice.

• note : these have matching prices and productcode.

Example

I attached a picture of my example because I suck at HTML formatting also.

Answer 1

You can use GROUP BY with multiple columns, to combine all the rows where those columns match. Then just sum the productUnits in those rows.

SELECT productCode, productPrice, SUM(productUnits) AS productUnits, productPrice * SUM(productUnits) AS totals
FROM orders_products
GROUP BY productCode, productPrice