Explanation:Not null constraint removes the tpules of null values. 5. In a employee table to include the attributes whose value always have some value which of the following constraint must be used ?
A. Null
B. Not null
C. Unique
D. Distinct
Answer:A
Explanation:Not null constraint removes the tpules of null values. 5. In a employee table to include the attributes whose value always have some value which of the following constraint must be used ?
A. Null B. Not null C. Unique D. Distinct
Explanation:Not null constraint removes the tpules of null values. 6. Using the ______ clause retains only one copy of such identical tuples.