Users Without Paid Orders
CRM is preparing a reactivation campaign and needs users who have no orders with status = 'paid', including users who never ordered at all. Return their id values in ascending order.
Expected output sample
This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.
| id |
|---|
| 3 |
| 4 |
| 5 |
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