SELECT activity_id, count(*) FROM activity_prize_lottery_record GROUP BY activity_id HAVING count(*) > 0
output:
+--------------+----------+--+
| activity_id | _c1 |
+--------------+----------+--+
| 6 | 5648 |
| 9 | 3607 |
| 1 | 1388 |
| 4 | 7292 |
| 7 | 5439 |
| 5 | 2595 |
+--------------+----------+--+