Can we DROP TABLE by foreign key constraint?

In SQL Server, you cannot drop a table if it is referenced by a FOREIGN KEY constraint. You have to either drop the child tables before removing the parent table, or remove foreign key constraints.

How do you drop a table that is referenced by a foreign key constraint?

State’ — Drop the foreign key constraint by its name ALTER TABLE dbo….

  1. Select the tables you want to DROP.
  2. Select “Save to new query window”.
  3. Click on the Advanced button.
  4. Set Script DROP and CREATE to Script DROP.
  5. Set Script Foreign Keys to True.
  6. Click OK.
  7. Click Next -> Next -> Finish.
  8. View the script and then Execute.

How do I drop a table with constraints?

Procedure

  1. To explicitly drop unique constraints, use the DROP UNIQUE clause of the ALTER TABLE statement.
  2. To drop primary key constraints, use the DROP PRIMARY KEY clause of the ALTER TABLE statement.
  3. To drop (table) check constraints, use the DROP CHECK clause of the ALTER TABLE statement.

How do I drop a foreign key reference in SQL Server?

You can try it if the commands do not work.

  1. Expand your database view.
  2. Right Click on Table which has foreign key constraint.
  3. Right click on the column which has the foreign key reference.
  4. A list of relationships will appear (if you have one) in a pop up window.
  5. From there you can delete the foreign key constraint.

How do I delete a foreign key constraint in SQL?

To delete a foreign key constraint

  1. In Object Explorer, expand the table with the constraint and then expand Keys.
  2. Right-click the constraint and then click Delete.
  3. In the Delete Object dialog box, click OK.

How do I delete a foreign key constraint in SQL Server?

Creating a foreign key with DELETE and UPDATE CASCADE rules

  1. Select the parent table and the primary key column in the parent table.
  2. In the INSERT and UPDATE specifications, select Cascade for the delete rule.
  3. Click on Close and save the table in the designer.

How do I delete a foreign key constraint in Oracle?

When you create a foreign key constraint, Oracle default to “on delete restrict” to ensure that a parent rows cannot be deleted while a child row still exists. However, you can also implement on delete cascade to delete all child rows when a parent row is deleted.