Oracle PL/SQL/Constraints/DELETE CASCADE

Create a foreign key with a cascade delete with more than one field

SQL> -- create a foreign key with a cascade delete with more than one field
SQL>
SQL>     CREATE TABLE supplier
  2      (      supplier_id     numeric(10)     not null,
  3             supplier_name   varchar2(50)    not null,
  4             contact_name    varchar2(50),
  5             CONSTRAINT supplier_pk PRIMARY KEY (supplier_id, supplier_name)
  6      );
Table created.
SQL>
SQL>
SQL>     CREATE TABLE products
  2      (      product_id      numeric(10)     not null,
  3             supplier_id     numeric(10)     not null,
  4             supplier_name   varchar2(50)    not null,
  5             CONSTRAINT fk_supplier_comp
  6               FOREIGN KEY (supplier_id, supplier_name)
  7              REFERENCES supplier(supplier_id, supplier_name)
  8              ON DELETE CASCADE
  9      );
Table created.
SQL>
SQL>     desc products;
 Name                                                                                                  Null?    Type
 ----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------
 PRODUCT_ID                                                                                            NOT NULL NUMBER(10)
 SUPPLIER_ID                                                                                           NOT NULL NUMBER(10)
 SUPPLIER_NAME                                                                                         NOT NULL VARCHAR2(50)
SQL>     desc supplier;
 Name                                                                                                  Null?    Type
 ----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------
 SUPPLIER_ID                                                                                           NOT NULL NUMBER(10)
 SUPPLIER_NAME                                                                                         NOT NULL VARCHAR2(50)
 CONTACT_NAME                                                                                           VARCHAR2(50)
SQL>
SQL>     drop table products cascade constraints;
Table dropped.
SQL>
SQL>     drop table supplier cascade constraints;
Table dropped.
SQL>