Sql server sql中的某些记录返回零

我在存储过程中有一个查询，它计算表中的一些记录：

SELECT
  t_Supporter.supporterID,
  COUNT(t_ticket.ticketID) AS totalTicket
FROM t_Supporter
INNER JOIN t_ticket
  ON t_Supporter.supporterID = t_ticket.supporterID_FK
WHERE (t_Supporter.orgSectionID_FK = @orgID)
GROUP BY t_Supporter.supporterID

---

如果

t\u-Supporter.supporterID

在

t\u-ticket

中没有记录，我如何使我的查询返回0您需要使用条件聚合将

COUNT

更改为

SUM

，并将

内部联接

更改为

左外部联接

SELECT t_Supporter.supporterID, SUM(CASE WHEN t_ticket.ticketID IS NOT NULL THEN 1 ELSE 0 END) AS totalTicket
FROM t_Supporter LEFT OUTER JOIN
     t_ticket ON t_Supporter.supporterID = t_ticket.supporterID_FK
WHERE  (t_Supporter.orgSectionID_FK = @orgID)
GROUP BY t_Supporter.supporterID