QuerydrillUnits sold per product
An SQL exercise from Querydrill. Solve it with a SQL editor in your browser, checked on the rows it returns and again on changed data, and it is checked the moment you submit.
The task
For each product_id, return the product_id and the total quantity sold, across all orders.
What this exercise teaches
SUM adds up a column per group; COUNT would count lines instead of units.
A hint if you get stuck
SUM(qty), grouped by product_id.
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