/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

15 votes262 views3 answers
Create table with primary key auto increment in sql
SQL
1 vote186 views1 answer
Round function in sql oracle
SQL
4 votes209 views1 answer
Oracle nls_date_format
SQL
0 vote202 views1 answer
Copied text from internet not inserting in mysql
SQL
0 vote144 views1 answer
Bigquery information_schema schema all columns
SQL
3 votes200 views2 answers
Sql random integer
SQL
1 vote236 views2 answers
Login to mysql
SQL
0 vote250 views1 answer
T-sql delete view if exists
SQL
5 votes197 views6 answers
In operator sql
SQL
0 vote195 views2 answers
2nd max salary query in sql
SQL