drop table goods;
drop table category;
drop table price;
create table category (
id integer primary key,
name varchar(200) not null
);
create table price (
id integer primary key,
cost int,
retail int
);
create table goods (
id integer primary key,
category_id integer references category (id),
price_id integer references price (id),
sample varchar(200),
name varchar(200) not null,
date date,
description varchar(200)
);