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-- basicly we need one table for store price changes history CREATE TABLE price_history ( id serial, price_date timestamp, price numeric ); -- for ability to store separated prices for different products -- we need to create table products CREATE TABLE products ( id serial primary key, name varchar ); -- and add column product_id into price_history ALTER TABLE price_history ADD product_id int REFERENCES products(id); -- add index for select performance CREATE INDEX price_history_product_id_ix ON price_history(product_id); -- because same product can have differen price at different suppliers -- we do next iteration CREATE TABLE suppliers ( id serial primary key, name varchar ); ALTER TABLE price_history ADD supplier_id int REFERENCES suppliers(id); CREATE INDEX price_history_supplier_id_ix ON price_history(supplier_id); -- same way we will add all parameters as city, devivery, and so on