COUNT的總和（終止日期）

Question

我在使用以下SQL時遇到一些困難：

SELECT SUM(mycount) 
FROM 
    (SELECT COUNT(DISTINCT `User`) AS mycount 
     FROM `DBname` 
     WHERE date(Created) >= '2016-07-01'
    ) as R ; 

目標是對一個月中唯一條目的計數求和。

Answer 1

SELECT SUM(mycount) 
FROM  (
    SELECT COUNT(DISTINCT `User`) AS mycount 
    FROM DBname 
    WHERE date(Created) >= '2016-07-01'
    GROUP BY date(Created)
) as R ;