Question

有人要求我创建一个包含两个Tabe部门和员工的完全外部联接的视图，如下所示：

创建一个新的视图名称作为全视图。获取以下列：MIN（LASTNAME）名称作为名称，不重复（manager_id）重命名为“ Available Manager_id”，计数（manager_id）重命名为“否”。 Manager_id”，以及每个job_id的总和（薪水）。应用完全外部联接

由于有人要求对每个job_id求和（薪水），因此我认为需要按分组使用，但我不知道如何使用。我非常感谢有人可以帮助我解决以下有关上述问题的陈述：

CREATE VIEW FULLVIEW
AS ( 
         SELECT MIN(LASTNAME) AS NAME,
                DISTINCT(E.MANAGER_ID) AS "Available Manager_id", 
                COUNT(E.MANAGER_ID) AS "No.of Manager_id",
                JOB_ID, 
                sum(salary)
           FROM EMPLOYEES E 
FULL OUTER JOIN DEPARTMENTS D
             ON E.DEPARTMENT_ID = D.DEPARTMENT_ID
       GROUP BY JOB_ID);

Answer 1

我为该问题找到的一个可能的正确答案如下：

CREATE VIEW fullview
AS
   (  SELECT DISTINCT (d.manager_id) AS "Available Manager_id",
                      MIN (lastname) AS name,
                      COUNT (d.manager_id) AS "No.of Manager_id",
                      job_id,
                      SUM (salary) AS salary
        FROM employees e
             FULL OUTER JOIN departments d ON e.manager_id = d.manager_id
    GROUP BY e.job_id, d.manager_id);

按加入条件分组

1 个答案: