求最大值（sum（））

Question

NullPointerException

我编写此查询以查找最大金额

create table dept
(
    did char(12) primary key,
    budget float,
    managerId int foreign key references emp
)

但是我想找到可以处理最大预算的managerId。

Answer 1

select top 1 sum(budget), managerId 
from dept 
group by managerId 
order by sum(budget) desc 

Answer 2

只需选择sum(budget)等于max的这些行。使用子查询来计算max

SELECT managerId 
FROM dept 
GROUP BY managerId 
HAVING sum( budget ) = (
         SELECT MAX(aa) as max 
         FROM (
            SELECT SUM(budget) AS aa FROM dept GROUP BY managerId
         ) dept
      )