Answered step by step
Verified Expert Solution
Question
1 Approved Answer
We have a query to retrieve the students with age 22 and studying in a CS 608 class. We can get all the student details
We have a query to retrieve the students with age 22 and studying in a CS 608 class. We can get all the student details from STUDENT table, and class details from the CLASS table. We can write this query in two different ways. 1. SELECT std. * FROM STUDENT std, CLASS cls WHERE std.CLASS_ID = cls.CLASS_ID AND std.AGE =22 AND cls.CLASS_NAME = 'CS608' II. SELECT std. FROM (SELECT FROM STUDENT WHERE AGE =22 ) std, (SELECT * FROM CLASS WHERE CLASS_NAME = 'CS608') cls WHERE std.CLASS_ID = cls.CLASS_ID Which of the following is true? Query 2 is more efficient because Query 1 traverses the entire table to perform the join while Query 2 has filters on each table significantly reducing the cost The cost of Query 1 is less than Query 2 Query 1 is more efficient because Query 2 has filters on each table thus increasing the cost Query 1 is more efficient since Query 2 has filters on each table thus will traverse through more tuples
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started