/SQL/Postgresql create table many-to-many

Postgresql create table many-to-many

CREATE TABLE product (
  product_id serial PRIMARY KEY  -- implicit primary key constraint
, product    text NOT NULL
, price      numeric NOT NULL DEFAULT 0
);

CREATE TABLE bill (
  bill_id  serial PRIMARY KEY
, bill     text NOT NULL
, billdate date NOT NULL DEFAULT CURRENT_DATE
);

CREATE TABLE bill_product (
  bill_id    int REFERENCES bill (bill_id) ON UPDATE CASCADE ON DELETE CASCADE
, product_id int REFERENCES product (product_id) ON UPDATE CASCADE
, amount     numeric NOT NULL DEFAULT 1
, CONSTRAINT bill_product_pkey PRIMARY KEY (bill_id, product_id)  -- explicit pk
);

Source: stackoverflow.com

Similar codes

0 vote186 views1 answer
Mysql workbench view
SQL
0 vote186 views1 answer
Sql auto_increment syntax
SQL
0 vote187 views1 answer
Flask sqlalchemy decimal
SQL
1 vote183 views1 answer
Mysql best tutorial for beginners
SQL
1 vote222 views1 answer
Mysql select update same table
SQL
0 vote178 views1 answer
Rows, INSERT INTO, Returning with alias
SQL
0 vote184 views1 answer
Login failed for login due to trigger execution
SQL
0 vote177 views3 answers
Postgresql grant alter table to user
SQL
20 votes194 views3 answers
How to open postgresql in mac
SQL
0 vote189 views1 answer
Create table database in psql
SQL