CREATE TABLE Stock_users (
  id serial primary key,
  mail text not NULL,
  password text not NULL,
  name text not NULL
);


CREATE TABLE Stock_kits (
  id serial primary key,
  name text not NULL,
  description text not NULL
);


CREATE TABLE Stock_providers (
  id serial primary key,
  address text not NULL,
  mail text not NULL,
  url text not NULL,
  comment text not NULL
);


CREATE TABLE Stock_componants (
  id serial primary key,
  name text not NULL,
  description text not NULL,
  last_price NUMERIC not NULL,
  mean_price NUMERIC not NULL,
  quantity NUMERIC not NULL,
  min_quantity NUMERIC not NULL,
  place text not NULL,
  provider_id integer REFERENCES Stock_providers(id)
);


CREATE TABLE Stock_kit_compositions (
  id serial primary key,
  kit_id integer REFERENCES Stock_kits(id),
  componant_id integer REFERENCES Stock_componants(id),
  quantity integer not NULL
);