如何在MySQL中找到计数结果的平均值？

Question

我想从计数结果中获取AVG。

SELECT labelname AS Record_Labels, COUNT(title) AS Number_of_CDs_Released FROM CD
JOIN RecordLabel ON labelname = released_by
GROUP BY labelname;             

我试过这样做：AVG（COUNT（标题）），但它没有用。任何人都可以帮助我吗？

Answer 1

您可以使用嵌套查询执行此操作：

select avg(Number_of_CDs_Released) from
(SELECT labelname AS Record_Labels, COUNT(title) AS Number_of_CDs_Released FROM CD
JOIN RecordLabel ON labelname = released_by
GROUP BY labelname) nested;