Which statement is correct for creating Check Constraint on an existing tables?

 Posted by vishalneeraj-24503 on 9/1/2014 | Category: Sql Server Interview questions | Views: 703 | Points: 40
Select from following answers:
  1. Alter Table Table_Name Add Check ([Col_Name] Is Not Null);
  2. Alter Table Table_Name Alter Check ([Col_Name] Is Not Null);
  3. Alter Table Table_Name Modify Constraint ([Col_Name] Is Not Null);
  4. All of the above.
  5. All Above

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