NOT IN with nulls fails
Review this query to find customers with no orders.
What a strong answer looks like
Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.
0:00 of about 18 min
Mark a line and say what kind of problem it is.0 findings
1SELECT * FROM customers
2WHERE id NOT IN (SELECT customer_id FROM orders);
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Run or narrate your approach, then ask the coach.