如何将以下3个查询压缩为一个？

Question

如何将以下3个查询压缩为一个？

select count(*) as fs1 from feedback WHERE feedbackStatus = 1
select count(*) as fs2 from feedback WHERE feedbackStatus = 2
select count(*) as fs3 from feedback WHERE feedbackStatus = 3

Answer 1

select count(*) as count_status, feedbackStatus
from feedback
where feedbackStatus in (1, 2, 3)
group by feedbackStatus

Answer 2

您可以尝试这样的查询：

select
  sum(feedbackStatus = 1) as fs1,
  sum(feedbackStatus = 2) as fs2,
  sum(feedbackStatus = 3) as fs3
 from feedback;