sql - 如何在sql中计算计数？

Question

我有下表：

memberid  
2
2
3
4
3

...我想要以下结果：

memberid    count
2           2
3           1    ---Edit by gbn: do you mean 2?
4           1

我试图使用：

  SELECT MemberID, 
         COUNT(MemberID) 
    FROM YourTable 
GROUP BY MemberID

...但是现在我想找到具有最大计数的记录。IE：

memberid   count
2          2

Answer 1

SELECT memberid, COUNT(*) FROM TheTable GROUP BY memberid

虽然，它不适用于您想要的输出，因为您有两次“memberid = 3”。

编辑：延迟更新问题后...

SELECT TOP 1 WITH TIES    --WITH TIES will pick up "joint top". 
    memberid, COUNT(*)
FROM
    TheTable 
GROUP BY 
    memberid
ORDER BY
    COUNT(*) DESC

Answer 2

SELECT MemberID, COUNT(MemberID) FROM YourTable GROUP BY MemberID

Answer 3

如果最大值出现平局（或更多）怎么办？您要显示一个还是全部？

我就是这样做的

SELECT memberid, COUNT(1)
FROM members
GROUP BY memberid
HAVING COUNT(1) = (
            SELECT MAX(result.mem_count)
            FROM (  
                SELECT memberid, COUNT(1) as mem_count
                FROM members
                GROUP BY memberid
            ) as result
          )

不过，我希望看到一种更有效的方法。

Answer 4

This should do the trick with no subselects required:

select top 1 memberid, COUNT(*) as counted 
from members
group by memberid
order by counted desc

Answer 5

Can be done quite easy:

SELECT TOP 1 MemberId, COUNT(*) FROM YourTable GROUP BY MemberId ORDER By 2 DESC

Answer 6

I believe the original poster requested 2 result sets.

The only way I know of to get this (in SQL Server) is to dump the original records into a temp table and then do a SELECT and MAX on that. I do welcome an answer that requires less code!

-- Select records into a temp table
SELECT
    Table1.MemberId
    ,CNT = COUNT(*)
INTO #Temp
FROM YourTable AS Table1
GROUP BY Table1.MemberId
ORDER BY Table1.MemberId

-- Get original records
SELECT * FROM #Temp

-- Get max. count record(s) 
SELECT 
    Table1.MemberId
    ,Table1.CNT
FROM #Temp AS Table1
INNER JOIN (
    SELECT CNT = MAX(CNT)
    FROM #Temp
) AS Table2 ON Table2.CNT = Table1.CNT

-- Cleanup 
DROP TABLE #Temp

Answer 7

这个查询怎么样：

SELECT TOP 1 MemberID, 
       COUNT(MemberID) 
FROM YourTable 
GROUP BY MemberID
ORDER by count(MemberID) desc

Answer 8

像这样做：

SELECT memberid, COUNT(memberid) AS [count] FROM [Table] GROUP BY memberid

Answer 9

从你的表中选择计数（列名）；

Answer 10

您需要使用子选择：

SELECT MemberID, MAX(Count) FROM
    (SELECT MemberID, COUNT(MemberID) Count FROM YourTable GROUP BY MemberID)
GROUP BY MemberID

第二个 group by 需要返回 count 和 MemberID。