Question: 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

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

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!