我在使用以下 SQL 时遇到一些困难:
SELECT SUM(mycount)
FROM
(SELECT COUNT(DISTINCT `User`) AS mycount
FROM `DBname`
WHERE date(Created) >= '2016-07-01'
) as R ;
目标是对一个月内唯一条目的计数求和。
最佳答案
SELECT SUM(mycount)
FROM (
SELECT COUNT(DISTINCT `User`) AS mycount
FROM DBname
WHERE date(Created) >= '2016-07-01'
GROUP BY date(Created)
) as R ;
关于mysql - 计数总和(不同日期),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38426724/