Products That Were Ordered
The catalog flags products that appear at least once in order_items. Rewrite the report in a set-based form and return the unique product id values, sorted by id.
Original query
SELECT p.id FROM products p WHERE EXISTS (SELECT 1 FROM order_items oi WHERE oi.product_id = p.id) ORDER BY p.id
Uzorak očekivanog izlaza
Ovako izgleda ispravan odgovor — broj redaka je njegov vlastiti, ne mora se podudarati s tablicama sheme.
| id |
|---|
| 1 |
| 2 |
| 3 |
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