Question

表仓库的表结构

CREATE TABLE Warehouse (
  wID NUMBER(25)  ,
  Location VARCHAR2(70) ,
  Num_Employees NUMBER(25) ,
  Stock NUMBER(25) ,
  PRIMARY KEY  (wID)
);

CREATE SEQUENCE WAREHOUSE_SEQ 
    START WITH 1 
    INCREMENT BY 1 
    NOMAXVALUE;


INSERT INTO Warehouse (wID, Location, Num_Employees, Stock) 
    VALUES (WAREHOUSE_SEQ.nextval , 'Dallas', '3', '13');
INSERT INTO Warehouse (wID, Location, Num_Employees, Stock) 
    VALUES (WAREHOUSE_SEQ.nextval , 'Denver', '3', '07');
INSERT INTO Warehouse (wID, Location, Num_Employees, Stock) 
    VALUES (WAREHOUSE_SEQ.nextval , 'Detroit', '3', '09');
INSERT INTO Warehouse (wID, Location, Num_Employees, Stock) 
    VALUES (WAREHOUSE_SEQ.nextval , 'Phoenix', '3', '14');
INSERT INTO Warehouse (wID, Location, Num_Employees, Stock) 
    VALUES (WAREHOUSE_SEQ.nextval , 'Atlanta', '3', '07');

查询：

SELECT DISTINCT
    Orders.wID,
    person.name,
    Employee.*,
    Warehouse.wID
FROM person
    INNER JOIN Orders ON Orders.wID = Warehouse.wID
    INNER JOIN Warehouse ON Warehouse.LOCATION=Employee.WORK_LOCATION
    INNER JOIN Employee ON Employees.ETYPE='Manager'
    WHERE Employee.EID = person.Id;

Answer 1

问题是你的第一次加入： 'FROM INNER JOIN Orders ON Orders.wID = Warehouse.wID'

目前“仓库”表尚未提供，但您已经在“开启”部分提及了它。

Answer 2

试试这个..

SELECT DISTINCT Orders.wID, person.name, Employee.*, Warehouse.wID 
FROM person INNER JOIN Employee         
ON   person.Id =  Employee.EID         
INNER JOIN Warehouse                        
ON Warehouse.LOCATION = Employee.WORK_LOCATION    
INNER JOIN Orders  
ON Orders.wID = Warehouse.wID
WHERE Employees.ETYPE ='Manager';

Answer 3

试试这样：

SELECT DISTINCT Orders.wID,
  person.NAME,
  Employee.*,
  Warehouse.wID
FROM person
INNER JOIN Employee ON Employee.EID = person.Id;
INNER JOIN Warehouse ON Warehouse.LOCATION = Employee.WORK_LOCATION
INNER JOIN Orders ON Orders.wID = Warehouse.wID
WHERE Employees.ETYPE = 'Manager'

内部加入ORA-00904：无效的标识符

3 个答案: