primary key is foreign key for the same table?
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Answer / javed a. khan
Yes this is possible and it will allow.
CREATE TABLE learn_01(book_id NUMBER,
book_name VARCHAR2(100),
book_genre VARCHAR2(100),
isbn_number NUMBER ,
author VARCHAR2(100),
ref_book_id NUMBER)
alter table learn_01 add constraint book_pk primary key (book_id)
alter table learn_01 add constraint foreign key book_rf (ref_book_id) references learn_01
ALTER TABLE learn_01 add CONSTRAINT book_fk1 FOREIGN KEY (book_id) REFERENCES learn_01(book_id);
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