booktown=# SELECT isbn, stock booktown-# FROM stock
booktown-# WHERE retail <= 25
booktown-# AND stock != 0:
isbn | stock
0441172717 | 77
0590445065 | 10
0679803335 | 18
0760720002 | 28
09296C5942 | 25
1885418035 | 77
(6 rows)