/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

1 vote145 views1 answer
Sql select sum group by id laravel
SQL
0 vote120 views1 answer
Import mysql'
SQL
1 vote123 views1 answer
Search for replace in mysql
SQL
1 vote115 views1 answer
Sqlite check if row exists
SQL
2 votes114 views1 answer
Oracle find unusable indexes
SQL
12 votes104 views5 answers
Sql merge
SQL
3 votes127 views1 answer
Insert into table from another table mysql
SQL
4 votes172 views1 answer
Oracle change nls_date_format permanently
SQL
16 votes117 views2 answers
Mysql date between two dates
SQL
1 vote115 views1 answer
Oracle split string
SQL