Indexing, Hashing, and Query

Create a table

INSERT INTO Students VALUES
(101, 'Arun', 'CSBS', 8.5),
(102, 'Mathan', 'ECE', 8.8),
(103, 'Karthik', 'MECH', 6.9),
(104, 'Hareesh', 'CSE', 9.1),
(105, 'Ravi', 'EEE', 7.2),
(106, 'Srivishal', 'CSBS', 8.8),
(107, 'Vignesh', 'IT', 8.0),
(108, 'Harish', 'CSE', 9.3),
(109, 'Deepak', 'ECE', 7.5),
(110, 'Nidheesh', 'CSBS', 9.0),
(111, 'Pradeep', 'MECH', 6.8),
(112, 'Lokhitha', 'EEE', 7.6),
(113, 'Raj', 'CSBS', 8.7),
(114, 'Divya', 'IT', 8.4),
(115, 'Saravanan', 'CSE', 9.2),
(116, 'Monika', 'ECE', 7.9),
(117, 'Ganesh', 'MECH', 6.7),
(118, 'Kavya', 'CSBS', 9.1),
(119, 'Surya', 'EEE', 7.3),
(120, 'Anitha', 'IT', 8.2);

Create a B-Tree Index on roll_no
CREATE INDEX idx_rollno ON Students(roll_no);

Query Using B-Tree Index

SELECT * FROM Students WHERE roll_no = 110;

Create a B+ Tree Index on cgpa

SELECT * FROM Students WHERE cgpa > 8.0;

Query Using Hash Index

SELECT * FROM Students WHERE dept = 'CSBS';