Preamble
After creating a foreign key, you may need to drop the foreign key from the table. You can do this with the ALTER TABLE operator in Oracle/PLSQL.
Syntax to drop a foreign key in Oracle / PLSQL
ALTER TABLE table_name
DROP CONSTRAINT constraint_name;
Example
If you created a foreign key like this:
CREATE TABLE supplier
( supplier_id numeric(10) not null,
supplier_name varchar2(50) not null,
contact_name varchar2(50),
CONSTRAINT supplier_pk PRIMARY KEY (supplier_id)
);
CREATE TABLE products
( product_id numeric(10) not null,
supplier_id numeric(10) not null,
CONSTRAINT fk_supplier
FOREIGN KEY (supplier_id)
REFERENCES supplier(supplier_id)
);
In this example we created the primary key table of the supplier called supplier_pk.
It consists of only one supplier_id field. Then we created a foreign key named fk_supplier in the products table that refers to the supplier table based on the supplier_id field.
If we need to drop the foreign key named fk_supplier, we need to execute the following command:
ALTER TABLE products
DROP CONSTRAINT fk_supplier;
SQL tutorials: SQL Foreign Key Constraint
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