Define foreign key for a table : FOREIGN KEY « Constraints « PostgreSQL

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PostgreSQL » Constraints » FOREIGN KEY 
Define foreign key for a table


postgres=#
postgres=# -- Foreign Keys
postgres=#
postgres=# CREATE TABLE products (
postgres(#    product_no integer PRIMARY KEY,
postgres(#    name text,
postgres(#    price numeric
postgres();
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "products_pkey" for table "products"
CREATE TABLE
postgres=#
postgres=# CREATE TABLE orders (
postgres(#    order_id integer PRIMARY KEY,
postgres(#    product_no integer REFERENCES products (product_no),
postgres(#    quantity integer
postgres();
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "orders_pkey" for table "orders"
CREATE TABLE
postgres=#
postgres=# drop table products cascade;
NOTICE:  drop cascades to constraint orders_product_no_fkey on table orders
DROP TABLE
postgres=# drop table orders cascade;
DROP TABLE
postgres=#
postgres=#
           
       
Related examples in the same category
1. Reference two two columns as foreign key column
2. Adding constraints (FOREIGN KEY) to a table
3. Adding a constraint to an existing table: add foreign key to table
4. Create FOREIGN KEY
5. Using foreign keys
6. ALTER TABLE employee ADD FOREIGN KEY (group_id) REFERENCES product_groups
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