HAVING子句中的多个聚合函数

Question

由于我的查询的性质,我的记录计数为3,也符合计数为2的标准,依此类推.我想知道是否可以查询"计数超过x且小于7"？我怎么能写这个.这是我目前的代码.

GROUP BY meetingID
HAVING COUNT( caseID )<4

我喜欢类似的东西

GROUP BY meetingID
HAVING COUNT( caseID )<4 AND >2

那样它只计算3

Answer 1

GROUP BY meetingID
HAVING COUNT(caseID) < 4 AND COUNT(caseID) > 2

Answer 2

没有必要进行两次检查,为什么不检查count = 3:

GROUP BY meetingID
HAVING COUNT(caseID) = 3

如果要使用多项检查,则可以使用:

GROUP BY meetingID
HAVING COUNT(caseID) > 2
 AND COUNT(caseID) < 4

Answer 3

对于您的示例查询，大于 2 且小于 4 的唯一可能值是 3，因此我们简化：

GROUP BY meetingID
HAVING COUNT(caseID) = 3

在您的一般情况下：

GROUP BY meetingID
HAVING COUNT(caseID) > x AND COUNT(caseID) < 7

或者（可能更容易阅读？），

GROUP BY meetingID
HAVING COUNT(caseID) BETWEEN x+1 AND 6