Oracle 单行子查询返回多行错误

Question

我有一个场景。这可以使用一个查询来完成吗？

• 表公司：单一公司信息，以 CPK 作为主键，并附有一个 Manager、Lead、HR

• 员工表：对于每家公司，都有员工（1 人或更多人最多可达 500 人）具有唯一的 empID 和附加的经理、主管、人力资源

• 表员工信息（用于使用 Web 应用程序）：为他分配了 1 个或多个 Manager、Lead、HR（或可以是 ALL、ALL、ALL，这意味着他可以看到所有内容）

  李>

所以：

Company
--------
CPK (PK)
Manager
Lead
HR

Employees 
--------
empID (PK)
CPK (FK)
Manager
Lead
HR

EmployeesInfo
-------------
USER_ID (FK)
Manager
Lead
HR

Web --> 当用户登录时，他应该获取所有公司信息。如果他有权访问该公司或该公司内的任何员工，则启用该行，否则如果其为“全部”，则该行显示为灰色（禁用），然后他可以编辑每条记录

例如： 将 User1 分配给 Manager1、Lead1 和 HR1。
然后他可以编辑公司中经理 = Manager1、Lead = Lead1 和 HR = HR1 的所有记录。
还记录在具有 Company.CPK = Employee.CPK 和 Employee.Manager = Manager1 和 Employee.Lead = Lead1 和 Employee.HR = HR1 的员工的公司中

我的查询到现在但是

select t2.MANAGER from Employees t2 where t2.CPK  = t1.CPK

返回多条记录，我应该怎么做？？？

SELECT  t1.*,
      --All condition
      CASE WHEN (SELECT MANAGER FROM EmployeesInfo WHERE USER_ID=44) = 'All' then 1
           ELSE(
                --Check for Company
                CASE 
                WHEN t1.MANAGER  in (SELECT MANAGER FROM EmployeesInfo WHERE USER_ID=44) then 1
                WHEN t1.LEAD in (SELECT LEAD FROM EmployeesInfo WHERE USER_ID=44) then 1
                WHEN t1.HR  in (SELECT HR FROM EmployeesInfo WHERE USER_ID=44) then 1
           ELSE(
                --Check Employee M,L,HR for that Company 
                CASE
                WHEN (SELECT t2.MANAGER FROM Employees t2 WHERE t2.CPK  = t1.CPK) in 
                       (SELECT MANAGER FROM EmployeesInfo WHERE USER_ID=44) then 1
                WHEN (SELECT t2.LEAD FROM Employees t2 WHERE t2.CPK = t1.CPK ) in 
                       (SELECT LEAD FROM EmployeesInfo WHERE USER_ID=44) then 1
                WHEN (SELECT t2.HR FROM Employees t2 WHERE t2.CPK  = t1.CPK  ) in 
                       (SELECT HR FROM EmployeesInfo WHERE USER_ID=44) then 1
                ELSE 0 END
                )
           END
           )
      END AS Grey_Out 
FROM Company t1 
WHERE  t1.CPK  ='1234'

最后我应该得到所有带有 gray_out 字段为 (1 或 0) 的公司，然后我将使用 Grey_Out 字段来查找是否应该使其可编辑。

Answer 1

我只是为了理解你的桌子设计而头疼。

您听说过联接吗？

SELECT DISTINCT c.*, 
       CASE WHEN e.empid IS NOT NULL OR ei.USER_ID IS NOT NULL
            THEN 1
            ELSE 0
       END AS Grey_Out 
FROM Company c
    LEFT OUTER JOIN EmployeesInfo ei
        ON c.MANAGER = ei.MANAGER 
        OR c.LEAD = ei.LEAD
        OR c.HR = ei.HR
    LEFT OUTER JOIN Employees e
        ON e.CPK = c.CPK
        AND (
               e.MANAGER = ei.MANAGER
            OR e.LEAD = ei.LEAD
            OR e.HR = ei.HR
        )
WHERE c.CPK = '1234'
AND ei.USER_ID = 44

Answer 2

改变

case
    when (select t2.MANAGER from Table2 t2 where t2.CPK  = t1.CPK) in 
      (Select MANAGER from Table3 where USER_ID=44) then 1

到

case
    when exists
        (select *
        from 
            Table3 t3
            inner join table2 t2 on t2.manager = t3.manager
        where 
            t3.USER_ID=44 and t2.CPK = t1.CPK) then 1