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CREATE TABLE BOOK(
    NO CHAR(8) PRIMARY KEY,
    TITLE VARCHAR2(50) NOT NULL,
    AUTHOR VARCHAR2(20) ,
    PUBLISH VARCHAR2(20),
    PUB_DATE DATE,
    PRICE NUMBER(6,2)
);
CREATE TABLE READER(
    RNO CHAR(6) PRIMARY KEY,
    RNAME VARCHAR2(20) NOT NULL
);
CREATE TABLE BORROW(
    NO CHAR(8),
    RNO CHAR(6),
    BORROW_DATE DATE DEFAULT SYSDATE, 
    PRIMARY KEY(NO,RNO),
    FOREIGN KEY (NO) REFERENCES BOOK(NO),
    FOREIGN KEY (RNO) REFERENCES READER(RNO)
);
 1).ÀûÓÃSQL Óï¾äʵÏÖÏò BOOK,READER ºÍBORROW ±íÖвåÈëÊý¾Ý£¬²åÈëºó±íÖÐÊý¾ÝÈçÏÂ
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PUB_DATE
PRICE
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2003-01-01
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2004-04-03
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