选择mysql返回的所有值的平均值

Question

如何使用SQL查找此查询的平均值：

SELECT  count(col1) as count FROM table1 GROUP BY col1 HAVING count > 1

我正在尝试查找每col1

的平均行数

到目前为止，我设法找到每col1行的总行数，现在我只需要平均值

Answer 1

select avg( c ) 
from ( SELECT  count(col1) as c FROM table1 GROUP BY col1 HAVING count > 1 )

Answer 2

对于表格，您需要别名并将count更改为count(*)。

查询：

SELECT avg(t1.c) AS avgcol1
FROM
  (SELECT count(col1) AS c
   FROM table1
   GROUP BY col1 HAVING COUNT(*) > 1) t1