QuerydrillProducts per order
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 order_id that has order lines, return the order_id and how many different products it contains.
What this exercise teaches
Basket size is a classic e-commerce metric.
A hint if you get stuck
COUNT(DISTINCT product_id), grouped by order_id.
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