Can we delete foreign key data?
Yes, you can. But you need to delete the foreign key constraint first in the database. Without the relationship constraints, you can pretty much drop the entire table containing the primary key as there are no more dependencies.
How do I drop a foreign key reference in SQL Server?
You can try it if the commands do not work.
- Expand your database view.
- Right Click on Table which has foreign key constraint. …
- Right click on the column which has the foreign key reference. …
- A list of relationships will appear (if you have one) in a pop up window.
- From there you can delete the foreign key constraint.
How do I delete a dependencies in SQL Server?
Right-click the Customers table in SQL Server Object Explorer, and select Delete. In the Preview Database Updates dialog, under User Action, notice that SSDT has identified all the dependent objects, in this case, a foreign key reference that will be dropped. Click Update Database.
How do I temporarily disable foreign key constraints in SQL Server?
Right click the table design and go to Relationships and choose the foreign key on the left-side pane and in the right-side pane, set Enforce foreign key constraint to ‘Yes’ (to enable foreign key constraints) or ‘No‘ (to disable it). You can temporarily disable constraints on your tables, do work, then rebuild them.
Can we delete foreign key data without deleting primary key?
If you want the department to remain and to be able to do this, you will need to alter the foreign key to include ON DELETE SET NULL. Otherwise, you will have to drop the constraint, perform the delete, and recreate the constraint.
Can we delete the primary key?
To delete a primary key constraint using Object Explorer
In Object Explorer, expand the table that contains the primary key and then expand Keys. Right-click the key and select Delete. In the Delete Object dialog box, verify the correct key is specified and click OK.
What is difference between primary key and foreign key?
Primary key uniquely identify a record in the table. Foreign key is a field in the table that is primary key in another table. Primary Key can’t accept null values.
Can foreign key be null?
A foreign key containing null values cannot match the values of a parent key, since a parent key by definition can have no null values. However, a null foreign key value is always valid, regardless of the value of any of its non-null parts. … A foreign key value is null if any part is null.
What is a foreign key example?
In simpler words, a foreign key is a set of attributes that references a candidate key. For example, a table called TEAM may have an attribute, MEMBER_NAME, which is a foreign key referencing a candidate key, PERSON_NAME, in the PERSON table.
How do I delete an object in SQL Developer?
Right-click on the object in the diagram, right-mouse-click, ‘Delete View. ‘ This will remove it from the SubView ONLY. If you say ‘Delete Object,’ it will remove it from the model entirely.
How do I drop a table with dependencies?
Deleting Tables with dependencies in SQL Server.
- Select the tables you want to DROP.
- Select “Save to new query window”.
- Click on the Advanced button.
- Set Script DROP and CREATE to Script DROP.
- Set Script Foreign Keys to True.
How do you delete an object in SQL?
How to safely delete SQL database objects
- Open SQL Server Management Studio.
- Right click the object that is to be deleted and select the Delete option from the drop down list:
- In the Delete object dialog, click the Show dependencies button: