Query
CREATE TABLE writtenBy (
ISBN VARCHAR(40),
TaxNo VARCHAR,
PRIMARY KEY (ISBN, TaxNo),
FOREIGN KEY (ISBN) REFERENCES Book(ISBN),
FOREIGN KEY (TaxNo) REFERENCES Author(TaxNo)
)
CREATE TABLE writtenBy (
ISBN VARCHAR(40),
TaxNo VARCHAR,
PRIMARY KEY (ISBN, TaxNo),
FOREIGN KEY (ISBN) REFERENCES Book(ISBN),
FOREIGN KEY (TaxNo) REFERENCES Author(TaxNo)
)