Mysql 只有当SUM返回某个值时，才有办法在SQL中显示行吗？

执行求和查询时，是否可能只显示某个值？例如，我有一个

business\u用户

表和一个慈善机构的

活动

表

如您所见，业务用户2有2个活动，而业务用户1有0个活动

mysql> select business_id, active from campaigns;
+-------------+--------+
| business_id | active |
+-------------+--------+
|           2 |      1 |
|           2 |      1 |
|           1 |      0 |
+-------------+--------+
3 rows in set (0.00 sec)

mysql> SELECT b.business_id, SUM(CASE WHEN c.active = true THEN 1 ELSE 0 END) as active_campaigns
    -> FROM business_users b, campaigns c
    -> WHERE b.business_id = c.business_id
    -> GROUP BY c.business_id;
+-------------+------------------+
| business_id | active_campaigns |
+-------------+------------------+
|           1 |                0 |
|           2 |                2 |
+-------------+------------------+

---

每当我执行上面的查询时，我都希望显示具有

活动=0

的行，并且不显示具有任何其他值的行。可以这样做吗？

将

具有活动的\u活动=0

添加到查询的结尾

将

具有活动的\u活动=0

添加到查询的结尾

SELECT b.business_id, SUM(CASE WHEN c.active = true THEN 1 ELSE 0 END) as active_campaigns
FROM business_users b, campaigns c
WHERE b.business_id = c.business_id
GROUP BY c.business_id
Having SUM(CASE WHEN c.active = true THEN 1 ELSE 0 END) = 0