How to set Default Constraint for top 100 or 5 rows in SQL

Question

Is this possible to add constraint, like the one below, using this method?

I am getting an error.

ALTER TABLE students 
ADD CONSTRAINT Adding_Default_Date
    DEFAULT 1 FOR (SELECT TOP 5 * FROM students);

Answer 1

In SQL Server, Check constraints only apply to individual rows.

Also, a Default constraints cannot access other rows.

It is not entirely clear from your description what you are trying to achieve.

If you want a Default constraint, but with your own custom logic, you might be able to achieve your goal with a Trigger.

CREATE TRIGGER Adding_Default_Date ON students
AFTER INSERT
AS Begin
  UPDATE s
  SET my_column = ...
  FROM student AS s
  JOIN inserted AS i
    ON i.key = s.key
End