/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

8 votes124 views4 answers
How to calculate the age from date of birth in python
SQL
0 vote126 views1 answer
Add created and updatedAt fields in mysql
SQL
1 vote105 views1 answer
Limit offset order by mysql
SQL
0 vote115 views1 answer
List all functions and procedures in postgres query
SQL
14 votes166 views1 answer
How to export db from mysql
SQL
0 vote119 views1 answer
Replace multiple string in query sql
SQL
4 votes152 views1 answer
Sql delete multiple conditions
SQL
0 vote109 views1 answer
Oracle create package body
SQL
0 vote116 views1 answer
Mysql min value row
SQL
4 votes110 views1 answer
Change nls_date_format
SQL