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Create Table employees ( id int primary key auto_increment, first_name VARCHAR(64), last_name VARCHAR(64) ); Create Table books ( id int primary key auto_increment, name VARCHAR(64), genre_id int, author VARCHAR(64), year int ); Create Table books_genres ( id int primary key auto_increment, genre_name VARCHAR(64) ); Create Table users ( id int primary key auto_increment, first_name VARCHAR(64), last_name VARCHAR(64) ); Create Table orders ( id int primary key auto_increment, employee int, user int, book int, get_at date, return_at date ); insert into orders (employee, user, book, get_at, return_at) values (1, 2, 3, '2022-01-09', '2022-01-15'), (3, 4, 5, '2022-01-18', null); select orders.*, DATEDIFF(COALESCE(return_at, CURRENT_DATE), get_at) days_in_rent from orders;