sql - 如何获得最大的名字？数据库

Question

我有疑问:

select max(sumValues) 
FROM (select dep.name AS sumName, sum(em.salary) AS sumValues 
from EMPLOYEE em 
INNER JOIN DEPARTMENT dep ON em.department_id=dep.id 
group by dep.id) a

结果我有:

|max numeric|
 -----------
   200

但是我想得到最大(max(sumValues))的结果名称(dep.name)，我该怎么做？

Answer 1

最简单的方法是排序并取第一个元组:

select sumName, sumValues
FROM (
    select dep.name AS sumName, sum(em.salary) AS sumValues 
    from EMPLOYEE em 
    INNER JOIN DEPARTMENT dep ON em.department_id=dep.id 
    group by dep.id
) a
ORDER BY sumValues DESC
LIMIT 1;

否则，您可以对 CTE 术语使用 HAVING 子句和子查询。

(LIMIT 是一个 PostgreSQL 扩展)