SQL SUM a column when for certain values of another 2 columns

Question

I need to retrieve the sum of 2 columns, price and quantity.

My table has this columns:

• id
• doc_id
• customer_cif
• customer_id
• product_code
• quantity
• price
• origin

What I need is to get the sum of quantity and price for every customer_cif and product_code.

Thanks in advance.

EDIT:

This is my initial query (it gets repeated product codes and customer_cif)

SELECT id, doc_id, customer_cif, customer_id, product_code, origin,
SUM(quantity) as totQuantity, 
SUM(price) as totPrice
FROM sellings
WHERE created_at BETWEEN '2019-03-01' AND '2019-05-30'
AND (customer_cif = '01176854J' OR customer_cif = '01176862K')
GROUP BY customer_cif, product_code, doc_id

Without the doc_id I get this error:

SQL Error [1055] [42000]: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'sellout.sci.doc_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

Answer 1

try this:

select
customer_cif ,product_code,
 sum(coalesce(quantity, 0)+coalesce(price, 0) )
from your_Table
group by customer_cif ,product_code;