SQL从最大计数返回所有字段

Question

我已经尝试但是无法得到结果所以我在这里寻求帮助。我在计算机上有一个登录表。我想计算用户登录计算机的次数，然后获取最大值，以便最大用户被视为计算机的主要用户。

Answer 1

根据您使用的dbms，您可以使用窗口函数ROW_NUMBER（）来对每个comp的计数进行排名。然后拉出最高排名。

SELECT 
  Comp,
  [User],
  Cnt
FROM
    (SELECT 
      Comp,
      [User],
      COUNT(1) AS Cnt,
      ROW_NUMBER() OVER (PARTITION BY Comp ORDER BY Count(1) DESC) AS Rnk
    FROM UserHist
    GROUP BY Comp, [User]) BaseTable
WHERE Rnk = 1

Answer 2

您可以RANK计数，然后选择最大值。这使用CTE来获取具有计数和排名的数据。

WITH CTECOMP AS
(
SELECT COMP, [user], COUNT([USER]) [USERCOUNT], 
       RANK() OVER (PARTITION BY COMP ORDER BY COUNT([USER]) DESC ) [MYRANK]
FROM @TableData 
GROUP BY comp, [user]
)
SELECT * 
FROM CTECOMP 
WHERE MYRANK = 1

Answer 3

select Comp, [User], count([User]) as MaxCnt
from TableHere
group by Comp, [User]