6. When RS=0, then the cost of computing R. Join S is a. the same as R S b. greater than R-S c. less than R. S d. cannot say anything If an entity can belong to only one lower-level entity, then the constraint is a. disinint
6. When RS=0, then the cost of computing R. Join S is a. the same as R S b. greater than R-S c. less than R. S d. cannot say anything If an entity can belong to only one lower-level entity, then the constraint is a. disinint
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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DBMS/With explanation
![6. When RS=0, then the cost of computing R. join S is
a. the same as R S
b. greater than R-S
c. less than R&S
d. cannot say anything
7. If an entity can belong to only one lower-level entity, then the constraint is
a. disjoint
b. partial
c. overlapping
d. total](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2c5e0b21-b05b-4ad5-aac0-fd46366f5b38%2F7461e64b-9277-474d-b06f-77cc68784eb6%2F1z7tmjh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:6. When RS=0, then the cost of computing R. join S is
a. the same as R S
b. greater than R-S
c. less than R&S
d. cannot say anything
7. If an entity can belong to only one lower-level entity, then the constraint is
a. disjoint
b. partial
c. overlapping
d. total
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