How do I truncate a foreign key constrained table in SQL Server?

You can’t truncate a table that has a foreign key constraint, that is the whole reason for having a constraint. You will need to delete and re-create the constraints so make sure you script them out before deleting them.

How do you delete a table with a foreign key constraint?

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 you break a foreign key constraint?

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.

Does truncate delete constraints?

Truncate also has the ability to reset the seed to its initial value. On delete triggers are also not fired and all foreign keys constraint must be removed or disabled. Instead of removing all constraints, it is possible to tell SQL Server to not check foreign key.

Does truncate check foreign key?

the original script truncates all referenced tables, this can cause foreign key violation error when the referenced table has other foreign key references.

Can we use truncate command on a table which is referenced by foreign key?

Cannot truncate table because it is being referenced by a FOREIGN KEY constraint.

Which statement should you use to remove a foreign key?

Description. Once a foreign key has been created, you may find that you wish to drop the foreign key from the table. You can do this with the ALTER TABLE statement in SQL Server (Transact-SQL).

How can I delete primary key and foreign key in SQL?

Use SQL Server Management Studio

  1. In Object Explorer, expand the table that contains the primary key and then expand Keys.
  2. Right-click the key and select Delete.
  3. In the Delete Object dialog box, verify the correct key is specified and select OK.

Which is faster DROP or TRUNCATE?

In SQL, the TRUNCATE command is used to remove all the rows from the table. However, the structure of the table and columns remains the same. It is faster than the DROP command.

What is the difference between DROP delete and TRUNCATE?

Unlike TRUNCATE which only deletes the data of the tables, the DROP command deletes the data of the table as well as removes the entire schema/structure of the table from the database.