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create table authors ( author_id SERIAL PRIMARY KEY, author_name VARCHAR(30) NOT NULL );
CREATE TABLE books ( book_id SERIAL PRIMARY KEY, isbn VARCHAR(50) UNIQUE NOT NULL, book_title VARCHAR(30) NOT NULL, author_id INTEGER REFERENCES authors(author_id) NOT NULL, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL );
create table books_store ( books_store_id SERIAL PRIMARY KEY, book_id INTEGER REFERENCES books(book_id) NOT NULL, quantity INTEGER NOT NULL );
create table book_expiry ( book_expiry_id SERIAL PRIMARY KEY, book_id INTEGER REFERENCES books(book_id) NOT NULL, discontinued BOOLEAN NOT NULL );
create table users ( user_id SERIAL PRIMARY KEY NOT NULL, user_name VARCHAR(30) NOT NULL );
create table checkouts ( checkout_id SERIAL PRIMARY KEY, book_id INTEGER REFERENCES books(book_id) NOT NULL, taken_by INTEGER REFERENCES users(user_id) NOT NULL, return_time timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP );
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