Sample Tables to be downloaded: create table authors (au_id varchar(11) not null, au_lname varchar(40) not null, au_fname varchar(20) not null, phone char(12) not null, address varchar(40) null, city varchar(20) null, state char(2) null, country varchar(12) null, postalcode char(10) null); create table publishers (pub_id char(4) not null, pub_name varchar(40) null, city varchar(20) null, state char(2) null); create table titleauthor (au_id varchar(11) not null, title_id varchar(6) not null, au_ord int null, royaltyper int null); create table titles (title_id varchar(6) not null, title varchar(80) not null, type char(12) not null, pub_id char(4) null, price number null, advance number null, total_sales int null, notes varchar(200) null, pubdate date not null, contract int not null ); create table stores (stor_id char(4) not null, stor_name varchar(40) null, stor_address varchar(40) null, city varchar(20) null, state char(2) null, country varchar(12) null, postalcode char(10) null, payterms varchar(12) null);