Analyzing Requirements and Defining Solution Architectures



 
   

A. Set up a default constraint on the primary key column

B. Set up a default constraint on the columns that will be filled in later, and ensure that none of these fields are the primary key column

C. Set up a check constraint that checks to see whether the field to be completed later isn't empty

D. Set up a unique constraint on the columns that will be filled in later, and ensure that none of these fields are the primary key column