The _____ constraint can be placed on a column to ensure that every row in the table has a value for that column.
A) UNIQUE
B) NOT NULL
C) VALUE
D) EMPTY

Question

Quizplus · Accepted Answer

The NOT NULL constraint ensures that a column cannot have a NULL or missing value, and therefore every row in the table must have a value for that column. UNIQUE constraint ensures that every value in the column is unique, but does not necessarily require every row to have a value. VALUE and EMPTY are not valid constraints in SQL.

The _____ Constraint Can Be Placed on a Column to Ensure