Plsql 错误：ORA-00937

我想创建一个新部门的表。我有部门ID和部门名称，在部门表中

            desc departments
            Name                            Null?    Type
            ------------------------------- -------- ----
            DEPARTMENT_ID                   NOT NULL NUMBER(4)
            DEPARTMENT_NAME                 NOT NULL VARCHAR2(30)
            MANAGER_ID                               NUMBER(6)
            LOCATION_ID                              NUMBER(4)

“我的员工”表包含：

            desc employees
            Name                            Null?    Type
            ------------------------------- -------- ----
            EMPLOYEE_ID                     NOT NULL NUMBER(6)
            FIRST_NAME                               VARCHAR2(20)
            LAST_NAME                       NOT NULL VARCHAR2(25)
            EMAIL                           NOT NULL VARCHAR2(25)
            PHONE_NUMBER                             VARCHAR2(20)
            HIRE_DATE                       NOT NULL DATE
            JOB_ID                          NOT NULL VARCHAR2(10)
            SALARY                                   NUMBER(8,2)
            COMMISSION_PCT                           NUMBER(2,2)
            MANAGER_ID                               NUMBER(6)
            DEPARTMENT_ID                            NUMBER(4)

现在，我想创建一个新部门表，该表应该包含部门ID和部门名称以及每个部门的总工资。每个部门都有一定数量的员工，因此，对于10、20、30等部门，应计算总工资

我的主要问题是：

           create table new_depts as
           select d.department_id,d.department_name,sum(e.salary) dept_sal
           from employees e,departments d
           where e.department_id = d.department_id;

我有一个错误：

           select d.department_id,d.department_name,sum(e.salary) dept_sal
              *
           ERROR at line 2:
           ORA-00937: not a single-group group function

所以，我用谷歌搜索了一下。我发现在select语句中不能使用sum、avg、max、min等组函数。我需要按子句分组。所以，我想单独解决这个问题。因此，我跳过了“CREATETABLE…”语句并写道：

           select distinct d.department_id,d.department_name,sum(e.salary) dept_sal
           from employees e,departments d
           where e.department_id = d.department_id
           group by department_id;         

我得到一个错误：

           group by department_id;
                  *
           ERROR at line 4:
           ORA-00911: invalid character      

然后我写道：

           select d.department_id,d.department_name,sum(e.salary) dept_sal
           from employees e,departments d
           where e.department_id = d.department_id
           group by d.department_id;

           select d.department_id,d.department_name,sum(e.salary) dept_sal
           from employees e,departments d
           where e.department_id = d.department_id
           group by department_id;

我得到一个错误：

           select d.department_id,d.department_name,sum(e.salary) dept_sal
                   *
           ERROR at line 1:
           ORA-00979: not a GROUP BY expression

           group by department_id
                   *
           ERROR at line 4:
           ORA-00918: column ambiguously defined

然后我写道：

           select d.department_id,d.department_name,sum(e.salary) dept_sal
           from employees e,departments d
           where e.department_id = d.department_id
           group by d.department_id;

           select d.department_id,d.department_name,sum(e.salary) dept_sal
           from employees e,departments d
           where e.department_id = d.department_id
           group by department_id;

我得到一个错误：

           select d.department_id,d.department_name,sum(e.salary) dept_sal
                   *
           ERROR at line 1:
           ORA-00979: not a GROUP BY expression

           group by department_id
                   *
           ERROR at line 4:
           ORA-00918: column ambiguously defined

---

我知道这是一个“加入”。但是我不知道我应该如何放置GROUPBY子句，这样我的GROUP函数才能正确运行

您需要按聚合函数中未包含的所有列进行分组，并且由于您已定义了表别名，因此必须在列中使用该别名。错误

ORA-00918:列定义模糊

是因为您有两列名为

部门id

，因此必须指定部门id来自的表：

select d.department_id,
  d.department_name,
  sum(e.salary) dept_sal
from employees e
inner join departments d
  on e.department_id = d.department_id
group by d.department_id, d.department_name;

---

您会注意到，我将查询更改为使用ANSI连接语法（

内部连接

）。

按部门id分组

不明确。您需要使用表别名。请尝试按d.department\u id分组。。可能重复是的，刚才我用您提到的代码自己解决了。谢谢