Oracle SQL檢查錯誤

Question

當我使用檢查約束時，爲什麼我的命令不起作用？不包括支票時可以添加表格。

create table Car (
     CarID   number(32,0) NOT NULL , 
     PurchaseDate date, 
     Colour varchar2(10) NOT NULL CHECK (Colour IN ("Red", "Blue", "Green")), 
     CONSTRAINT CAR_PK PRIMARY KEY (CarID), 
     FOREIGN KEY (CarID) REFERENCES Vehicle(ID) 

    ); 

Error report - 
SQL Error: ORA-02438: Column check constraint cannot reference other columns 
02438. 00000 - "Column check constraint cannot reference other columns" 
*Cause: attempted to define a column check constraint that references 
      another column. 
*Action: define it as a table check constriant. 

Answer 1

create table Car (
     CarID   number(32,0) NOT NULL , 
     PurchaseDate date, 
     Colour varchar2(10) NOT NULL CHECK (Colour IN ('Red', 'Blue', 'Green')), 
     CONSTRAINT CAR_PK PRIMARY KEY (CarID), 
     FOREIGN KEY (CarID) REFERENCES Vehicle(ID) 

    ); 

沒有雙引號在Oracle SQL允許