Question

我正在创建两个表。当我尝试创建第二个表（出租车），在最后一行的所有时间，我收到错误“主键或外键不匹配”。请允许任何人帮助我吗？我正在使用oracle。请在Shift表的最后一行看到相同的错误两个表格都在

之下

CREATE TABLE Driver (
  Driver_License VARCHAR2(50)   NOT NULL ,
  DOB DATE    ,
  Name VARCHAR2(50),
  Address VARCHAR2(250)    ,
  Tax VARCHAR2(50)    ,
  Insurance_Details VARCHAR2(250)    ,
  Blood_Group VARCHAR2(5)    ,
  Emergency_Contact_Name VARCHAR2(50)   NOT NULL ,
  Emergency_Contact_Number INTEGER    ,
  Wages_Hourly NUMERIC    ,
  Monthly NUMERIC    ,
  commissions NUMERIC    ,
  Driver_License_copy VARCHAR(3)    
      );

CREATE TABLE Taxi (
  Registration_Number VARCHAR(25)   NOT NULL ,
  Driver_License Varchar2(50),
  chasis_Number VARCHAR(25)    ,
  Model_Name VARCHAR2(250)    ,
  Year_Of_Manufacturing INTEGER    ,
  Seats INTEGER    ,
  MOT_TUV DATE    ,
  Expiry_MOT_TUV  DATE    ,
  Service DATE    ,
  Oil_Change  DATE    ,
  Total_Mileage INTEGER    ,
  Disable_transporter VARCHAR(3)    ,
  Issue_Date DATE,
FOREIGN KEY(Driver_License)
    REFERENCES Taxi(Driver_License)      
  );

Answer 1

猜测Driver表中的Driver_License字段被指定为NOT NULL，Taxi表中的Driver_License字段将默认为允许空值。

将其更改为： -

CREATE TABLE Taxi (
  Registration_Number VARCHAR(25)   NOT NULL ,
  Driver_License Varchar2(50) NOT NULL,
  chasis_Number VARCHAR(25)    ,
  Model_Name VARCHAR2(250)    ,
  Year_Of_Manufacturing INTEGER    ,
  Seats INTEGER    ,
  MOT_TUV DATE    ,
  Expiry_MOT_TUV  DATE    ,
  Service DATE    ,
  Oil_Change  DATE    ,
  Total_Mileage INTEGER    ,
  Disable_transporter VARCHAR(3)    ,
  Issue_Date DATE      ,
  FOREIGN KEY(Driver_License)
    REFERENCES Driver(Driver_License));

主键或外键不匹配

1 个答案: