SQL.每月平均参赛作品

Question

我在DB中有一些抽象的条目,它的创建日期.如何获得每月创建的平均条目？

编辑:

表具有Name字段和CreationDate字段.

Answer 1

SELECT count(*) AS count, MONTH(date_column) as mnth
FROM table_name
GROUP BY mnth

应该适合你

编辑:

SELECT AVG(a.count) AS avg 
FROM ( SELECT count(*) AS count, MONTH(date_column) as mnth
       FROM table_name
       GROUP BY mnth) AS a

Answer 2

试试这个

SELECT COUNT(*)/COUNT(DISTINCT MONTH(`datefield`)) FROM tablename

无子查询