/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

4 votes242 views3 answers
Create table if not exists postgresql
SQL
0 vote285 views1 answer
How to put 0 or 000 depending IDCustomer length in sql server
SQL
1 vote279 views1 answer
Oracle lock user
SQL
0 vote256 views1 answer
Get number of table colums in sql query
SQL
0 vote303 views1 answer
Csv to sqlite python
SQL
0 vote307 views1 answer
Normalization in database
SQL
19 votes297 views6 answers
Sql server drop table if exists
SQL
0 vote272 views1 answer
How to check if there is no database schema
SQL
0 vote358 views1 answer
ORA-32794: cannot drop a system-generated sequence
SQL
1 vote301 views1 answer
Mysql select for update ejemplo
SQL