SQL - SELECTING MAX返回不同的列

Question

我的問題是代碼是代碼返回員工的最高工資，包括管理員 當我想要它排除管理人員。

除了它的作品。

這裏是我寫的代碼：

SELECT firstname || ' ' || lastname 
AS "FULL NAME" 
FROM EMPLOYEES 
WHERE salary = 
    (SELECT MAX(salary) 
     FROM EMPLOYEES, DEPARTMENTS 
     WHERE NOT employee_id = manager_id); 

這裏是數據庫架構

COUNTRIES(country_id, country_name, region) 
• Primary key: {country_id} 

DEPARTMENTS(department_id, department_name, manager_id) 
• Primary key: {department_id } 
• Foreign key: [manager_id] ⊆ EMPLOYEES[employee_id] 

DEPT_LOCATIONS(department_id, city, country_id) 
• Primary key: {department_id, city} 
• Foreign key: [department_id] ⊆ DEPARTMENTS[department_id] and 
[country_id] ⊆ COUNTRIES[country_id] 

EMPLOYEES(employee_id, firstname, lastname, email, phone_no, salary, 
department_id) 
• Primary key: {employee_id} 
• Foreign key: [department_id] ⊆ DEPARTMENTS[department_id] 

任何幫助非常讚賞。

Answer 1

如果你的子查詢通過部門選擇最高的薪水，那麼你可以加入該結果由主管部門來獲得您的列表。

SELECT firstname || ' ' || lastname AS "FULL NAME", 
     E.department_id 
FROM EMPLOYEES E 
JOIN (
    SELECT E.department_id, MAX(E.salary) as MAX_SALARY 
    FROM EMPLOYEES E 
    JOIN DEPARTMENTS D ON E.department_id = D.department_id 
    WHERE employee_id <> manager_id 
    GROUP BY E.department_id 
) AS M ON M.MAX_SALARY = E.salary AND E.department_id = M.department_id 

，如果你不按部門希望它看起來像這樣：

SELECT firstname || ' ' || lastname AS "FULL NAME" 
FROM EMPLOYEES E 
JOIN (
    SELECT MAX(E.salary) as MAX_SALARY 
    FROM EMPLOYEES E 
    JOIN DEPARTMENTS D ON E.department_id = D.department_id 
    WHERE employee_id <> manager_id 
) AS M ON M.MAX_SALARY = E.salary 

Answer 2

這個怎麼樣？

SELECT e.firstname || ' ' || e.lastname 
AS "FULL NAME" 
FROM EMPLOYEES e 
WHERE e.salary = 
    (SELECT MAX(salary) 
     FROM EMPLOYEES, DEPARTMENTS 
     WHERE NOT employee_id = manager_id) 
AND NOT EXISTS (SELECT 1 FROM DEPARTMENTS d WHERE e.employee_id = d.manager_id) 

所有你需要的是篩選結果