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--Ερώτημα 1 CREATE VIEW REWARDS AS SELECT aName FROM AUTHOR WHERE aAwards IS NOT NULL; --Ερώτημα 2 CREATE VIEW MEMBER_INFO AS SELECT member.mNo,member.mLastName,member.mFirstName, member.mAddress,member.mRegDate,member.mBookCount,phone.mPhoneNo FROM MEMBER,PHONE WHERE member.mNo=phone.mNo; --Ερώτημα 3 CREATE VIEW NO_PHONE AS SELECT member.mNo,member.mLastName,member.mFirstName, member.mAddress,member.mRegDate,member.mBookCount FROM MEMBER,PHONE WHERE member.mNo=phone.mNo AND phone.mNo IS NULL; --Ερώτημα 5 CREATE VIEW NO_RETURN AS SELECT MEMBER.mFirstName,MEMBER.mLastName, BOOK.isbn,BOOK.bTitle,BORROWS.Outdate FROM MEMBER,BOOK,BORROWS WHERE MEMBER.mno=BORROWS.mno AND BOOK.isbn=BORROWS.isbn AND BORROWS.Outdate IS NULL; --Ερώτημα 6 CREATE SEQUENCE BorrowSeq INCREMENT BY 5 START WITH 2000; --Ερώτημα 7 ALTER TABLE BORROWS ADD BORROW_ID number; --Ερώτημα 8 UPDATE BORROWS SET BORROW_ID=BorrowSeq.nextval; ----Ερώτημα 10 CREATE INDEX Book_Index ON BOOK(bTitle);
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