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Database-Management-System
October 4, 2023
SQL
October 4, 2023
Database-Management-System
October 4, 2023
SQL
October 4, 2023

SQL

Question 30

Consider a database with three relation instances shown below. The primary keys for the Drivers and Cars relation are did and cid respectively and the records are stored in ascending order of these primary keys as given in the tables. No indexing is available

Let n be the number of comparisons performed when the above SQL query is optimally executed. If linear search is used to locate a tuple in a relation using primary key, then n lies in the range

A
36 – 40
B
44 – 48
C
60 – 64
D
100 – 104
Question 30 Explanation: 
(4) for taking red cars with (20) comparisons for did and (4) for finding green cars with (10) for did.
red did : 22, 31, 64
green did : 22, 31, 74
(6) for intersection
(1) for searching 22 in driver relation, and (3) for searching 31.
Total: 38 + 6 + 4 = 48
Correct Answer: B
Question 30 Explanation: 
(4) for taking red cars with (20) comparisons for did and (4) for finding green cars with (10) for did.
red did : 22, 31, 64
green did : 22, 31, 74
(6) for intersection
(1) for searching 22 in driver relation, and (3) for searching 31.
Total: 38 + 6 + 4 = 48
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