Paid Orders per Buyer

#998

Analytics needs, for each buyer who has orders with status = 'paid', the number of those orders. Replace the raw repeated-row approach with one row per user_id. Return user_id and paid_count, sorted by user_id.

Original query

SELECT DISTINCT o.user_id, (SELECT COUNT(*) FROM orders o2 WHERE o2.user_id = o.user_id AND o2.status='paid') AS paid_count FROM orders o WHERE o.status='paid' AND o.user_id IS NOT NULL ORDER BY o.user_id

Ukážka očakávaného výstupu

Takto vyzerá správna odpoveď — počet riadkov je jej vlastný, nemusí sa zhodovať s tabuľkami schémy.

user_id	paid_count
1	2
2	1

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