没有与此SQL匹配的唯一键或主键

Question

I'm trying to write this code

CREATE TABLE BOOK
(BOOKNO NUMBER(4) PRIMARY KEY NOT NULL,
BTIME NUMBER(24,22),
CNAME VARCHAR2(10) ,
BTYPE VARCHAR2(13),
TABLENO NUMBER(2),
EMPNO NUMBER(4),
ENAME VARCHAR2(10),
BDATE  DATE DEFAULT '23-MAR-13',
FOREIGN KEY (CNAME) REFERENCES BOOK (CNAME));

but it shows me that I have this error for creating my foregin key

ERROR at line 10:
ORA-02270: no matching unique or primary key for this column-list

Answer 1

Oracle/PLSQL: ORA-02270 Error

You tried to reference a table using a unique or primary key, but the columns that you listed did not match the primary key, or a primary key does not exist for this table.

CREATE TABLE BOOK
(BOOKNO NUMBER(4) PRIMARY KEY NOT NULL,
BTIME NUMBER(24,22),
CNAME VARCHAR2(10) ,
BTYPE VARCHAR2(13),
TABLENO NUMBER(2),
EMPNO NUMBER(4),
ENAME VARCHAR2(10),
BDATE  DATE DEFAULT '23-MAR-13',
FOREIGN KEY (CNAME) REFERENCES BOOK (BOOKNO));

UPDATE

CREATE TABLE BOOK
    (BOOKNO NUMBER(4) PRIMARY KEY NOT NULL,
    BTIME NUMBER(24,22),
    CNAME VARCHAR2(10) NOT NULL UNIQUE,
    BTYPE VARCHAR2(13),
    TABLENO NUMBER(2),
    EMPNO NUMBER(4),
    ENAME VARCHAR2(10),
    BDATE  DATE DEFAULT '23-MAR-13',
    FOREIGN KEY (CNAME) REFERENCES BOOK (CNAME));