1795. Rearrange Products Table ¶ SQL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20SELECT product_id, 'store1' AS store, store1 AS price FROM Products WHERE store1 IS NOT NULL UNION ALL SELECT product_id, 'store2', store2 FROM Products WHERE store2 IS NOT NULL UNION ALL SELECT product_id, 'store3', store3 FROM Products WHERE store3 IS NOT NULL;