Example:
  Objective: In this example, we will enforce a condition on the email address column. The character length of the email              address must be greater than 5.                                                                            CREATE TABLE TBL_EMP(Ecode varchar(20) Primary key,
                                  Name varchar(20),
                                  Emailaddress varchar(20) CHECK(len(emailaddress)>5),
                                  Department varchar(20),
                                  Salary int
                                       );