CREATE TABLE Student (
    Roll_No INT,
    Name VARCHAR(30),
    Age INT,
    Marks INT
);
INSERT INTO Student
VALUES (1, 'Ravi', 20, 85);

INSERT INTO Student
VALUES (2, 'Raju', 21, 90);

INSERT INTO Student
VALUES (3, 'Sita', 19, 95);
SELECT * FROM Student;
SELECT * FROM Student
WHERE Roll_No = 1;
UPDATE Student
SET Marks = 95
WHERE Roll_No = 1;
DELETE FROM Student
WHERE Roll_No = 2;