MCQs
Total Questions : 8
Answer: Option A. -> NULL, NULL
When we operate on a NULL and any value including another, NULL, using any attribute operator the result is NULL.
Answer: Option C. -> candidate keys.
Answer: Option B. -> permits many-to-many relationship
Answer: Option C. -> fourth normal form.
Answer: Option B. -> 2NF
Answer: Option C. -> referential integrity constraint.
Answer: Option B. -> I and II Only
SELECT and PROJECT are called unary operations because they operate on one relation.
Answer: Option B. -> two concurrent activities interact to cause a processing error