Question

原谅我的SQL知识，但我有一个Person表，其中包含以下数据 -

Id          Name
----        ------
1           a
2           b
3           b
4           c

我希望得到以下结果 -

Name      Total
------    ------
b         2

如果我使用GROUP BY查询 -

SELECT Name, Total=COUNT(*) FROM Person GROUP BY Name

它给了我 -

Name   Total
------ ------
a      1
b      2
c      1

但我只想要最大数量的那个。我怎么做到的？

Answer 1

在SQL Server中执行此操作的最简单方法是使用top语法：

SELECT   TOP 1 Name, COUNT(*) AS Total 
FROM     Person 
GROUP BY Name  
ORDER BY 2 DESC

Answer 2

如果你想要联系

SELECT top (1) with ties Name, COUNT(*) AS [count]
  FROM Person 
 GROUP BY Name  
 ORDER BY count(*) DESC

Answer 3

试试这个......

Answer 4

答案是：

WITH MaxGroup AS (
   SELECT Name, COUNT(*) AS Total
   FROM Person
   GROUP BY Name)
SELECT Name, Total
FROM MaxGroup
WHERE Total = (SELECT MAX(Total) FROM MaxGroup)

从GROUP BY操作中选择最大计数

4 个答案: