Which statement is true in this scenario?
A. You cannot add a primary key constraint if data exists in the column
B. You can add the primary key constraint even if data exists, provided that there are no duplicate values
C. The primary key constraint can be created only a the time of table creation
D. You cannot have two constraints on one column
Answer:B
Which statement is true in this scenario?
A. You cannot add a primary key constraint if data exists in the column B. You can add the primary key constraint even if data exists, provided that there are no duplicate values C. The primary key constraint can be created only a the time of table creation D. You cannot have two constraints on one column