sql-server - 为什么sql中的max函数返回多个值

Question

我想展示薪水最高的球员。

select  max(Salary) as highest_salary, p.[Last name]
from tbl_PlayersTable as p, tbl_team as t
where p.Team = t.TeamID
and TeamID = 1000
Group by p.[Last name]

输出是：

highest_salary  Last Name
   8000          Bosh
   7000          Wade
   6000          James

我只想展示（8000 波什，因为他是薪水最高的球员）。

Answer 1

您不需要MAX也不GROUP BY，只需使用TOP 1with ORDER BY Salary DESC。像这样的东西：

select TOP (1) Salary as highest_salary, p.[Last name]
from tbl_PlayersTable as p, tbl_team as t
where p.Team = t.TeamID
 and TeamID = 1000
ORDER BY Salary  DESC

Answer 2

因为您使用group by p.[Last name]以便查询将获得它找到max(Salary)的每个不同的。Last name所以如果你想得到max(Salary)所有的基础Last name，你必须删除group by

Answer 3

您在那里对值进行分组（请参阅最后的 Group By），因此您的 max 函数计算每组的最大值。如果您想要一个绝对最大值，请删除分组。

Answer 4

不需要group by甚至max：

select  top 1 Salary
,       [Last name]
from    tbl_PlayersTable
where   TeamID = 1000
order by
        salary desc

Answer 5

您将需要取前 1 个值

  select TOP (1) Salary as maxsalary, p.[Last name]
   from tbl_PlayersTable as p 
   Inner join  tbl_team as t on  p.Team = t.TeamID
  where TeamID = 1000
  ORDER BY Salary  DESC