使用主键和外键在sql developer中创建表

Question

我正在尝试使用以下语法为sql developer创建一个包含主键和外键的表，但它无效。

谁能看到我哪里出错了？

CREATE Athlete
(
    ATHLETEID CHAR(4) NOT NULL,
    ATHLETEFIRSTNAME VARCHAR2(20),
    ATHLETELASTNAME VARCHAR2(20),
    ATHLETEDOB DATE,
    REPCOUNTRY VARCHAR2(12),
    COACHID CHAR(4) NOT NULL,

    CONSTRAINT ATHLETE_PK PRIMARY KEY (ATHLETEID),
    CONSTRAINT ATHLETE_FK FOREIGN KEY (COACHID) REFERENCES COACH(COACHID) 

);

Answer 1

您忘记了TABLE关键字。

CREATE TABLE Athlete
(
    ATHLETEID CHAR(4) NOT NULL,
    ATHLETEFIRSTNAME VARCHAR2(20),
    ATHLETELASTNAME VARCHAR2(20),
    ATHLETEDOB DATE,
    REPCOUNTRY VARCHAR2(12),
    COACHID CHAR(4) NOT NULL,

    CONSTRAINT ATHLETE_PK PRIMARY KEY (ATHLETEID),
    CONSTRAINT ATHLETE_FK FOREIGN KEY (COACHID) REFERENCES COACH(COACHID) 

);

Answer 2

这应该有效

首先创建表，然后尝试更改表

ALTER TABLE Athlete ADD CONSTRAINT ATHLETE_PK PRIMARY KEY (ATHLETEID);

为外键试试这个

ALTER TABLE Athlete ADD CONSTRAINT ATHLETE_FK FOREIGN KEY (COACHID) REFERENCES COACH(COACHID);

Answer 3

CREATE TABLE Athlete  (
ATHLETEID CHAR(4) NOT NULL, 
ATHLETEFIRSTNAME VARCHAR2(20), 
ATHLETELASTNAME VARCHAR2(20), 
ATHLETEDOB  DATE, 
REPCOUNTRY VARCHAR2(12), 
COACHID CHAR(4) NOT NULL,

CONSTRAINT ATHLETE_PK PRIMARY KEY (ATHLETEID), 
CONSTRAINT ATHLETE_FK FOREIGN KEY (COACHID)    REFERENCES COACH(COACHID)

);