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Mysql 按从子查询分组中选择最大值_Mysql - Fatal编程技术网
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Mysql 按从子查询分组中选择最大值

mysql

Mysql 按从子查询分组中选择最大值,mysql,Mysql,是否可以选择子查询的最大值。我尝试了下面的SELECT MAXSELECT COUNTlid作为每天课程组的计数，但显然失败了。有什么建议吗 为什么不 SELECT COUNT(lid) AS count FROM Lessons GROUP BY day ORDER BY count desc limit 1 我相信这就是你要找的 SELECT MAX(myCount) FROM (SELECT COUNT(lid) AS myCount FROM Lessons GROUP BY da

是否可以选择子查询的最大值。我尝试了下面的SELECT MAXSELECT COUNTlid作为每天课程组的计数，但显然失败了。有什么建议吗

为什么不

SELECT COUNT(lid) AS count 
FROM Lessons 
GROUP BY day
ORDER BY count desc
limit 1
我相信这就是你要找的

SELECT MAX(myCount) FROM (SELECT COUNT(lid) AS myCount FROM Lessons GROUP BY day) AS sub Query