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
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