KTU S5 DBMS

8.sql

/*
AIM:
Create a cursor that stores the details of students eligible for honours in roll number order. Assume that semester grades of s1 and s2 are stored in students table along with Roll number and name of students. A student is eligible for honors if the total grade for s1 and s2 is greater than 12. Print the highest grade obtained in the previous semesters for honors students using the cursor created.
*/

-- Create the table to store the student details.
CREATE TABLE students (
	roll_number NUMBER,
	name VARCHAR2(20),
	s1 NUMBER,
	s2 NUMBER
);

-- Insert sample data.
INSERT INTO students VALUES (1, 'A', 7.5, 7);
INSERT INTO students VALUES (2, 'B', 8, 9.5);
INSERT INTO students VALUES (3, 'C', 9, 9);
INSERT INTO students VALUES (4, 'D', 8.8, 9);

-- Declare variables to store student details and highest grade.
DECLARE
    v_roll_number students.roll_number%TYPE;
    v_name students.name%TYPE;
    v_s1 students.s1%TYPE;
    v_s2 students.s2%TYPE;
    v_total_grade NUMBER;
    v_highest_grade NUMBER := 0;

    -- Cursor to fetch details of honors students.
    CURSOR honors_students_cursor IS
        SELECT roll_number, name, s1, s2
        FROM students
        WHERE s1 + s2 > 12
        ORDER BY roll_number;

BEGIN
    -- Open the cursor.
    OPEN honors_students_cursor;

    -- Fetch and process each honors student.
    LOOP
        FETCH honors_students_cursor INTO v_roll_number, v_name, v_s1, v_s2;
        EXIT WHEN honors_students_cursor%NOTFOUND;

        -- Calculate the total grade for the current student.
        v_total_grade := v_s1 + v_s2;

        -- Print student details.
        DBMS_OUTPUT.PUT_LINE('Roll Number: ' || v_roll_number);
        DBMS_OUTPUT.PUT_LINE('Name: ' || v_name);
        DBMS_OUTPUT.PUT_LINE('Total Grade (S1 + S2): ' || v_total_grade);

        -- Update the highest grade if needed.
        IF v_total_grade > v_highest_grade THEN
            v_highest_grade := v_total_grade;
        END IF;
    END LOOP;

    -- Close the cursor.
    CLOSE honors_students_cursor;

    -- Print the highest grade obtained by honors students.
    DBMS_OUTPUT.PUT_LINE('Highest Grade Obtained by Honors Students: ' || v_highest_grade);
END;
/