Drop a Foreign Key

ALTER TABLE statement is used to drop a foreign key from a table once it has been created.

Syntax:

ALTER TABLE table_name
DROP CONSTRAINT fk_name; 

Parameter explanation

table_name: It specifies the name of the table where the foreign key has been created.

fk_name: It specifies the name of the foreign key that you want to remove.

Example:

In the previous example we have seen how to create a foreign key.

CREATE TABLE products
( product_id INT PRIMARY KEY,
  product_name VARCHAR(50) NOT NULL,
  category VARCHAR(25)
);
CREATE TABLE inventory
( inventory_id INT PRIMARY KEY,
  product_id INT NOT NULL,
  quantity INT,
  min_level INT,
  max_level INT,
  CONSTRAINT fk_inv_product_id
    FOREIGN KEY (product_id)
    REFERENCES products (product_id)
);

Use the following command to drop the foreign key called fk_inv_product_id.

ALTER TABLE [javatpoint].[dbo].[inventory]
DROP CONSTRAINT fk_inv_product_id; 

Output:

Now the foreign key is dropped.

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