DatabaseManagementSystems/Practical/Assignment-A6/Queries-A6.md

Database Queries for Assignment-A6

Creating tables & inserting data

Student marks:

CREATE TABLE Stud_Marks(
    Roll NUMBER(14),
    name VARCHAR(255),
    total_marks NUMBER(14),
    PRIMARY KEY(Roll)

);

INSERT INTO Stud_Marks VALUES (1, 'Arora', 1350);
INSERT INTO Stud_Marks VALUES (2, 'Shankar', 979);
INSERT INTO Stud_Marks VALUES (3, 'Lara', 834);
INSERT INTO Stud_Marks VALUES (4, 'Jambo', 667);
INSERT INTO Stud_Marks VALUES (5, 'Tinde', 1400);

Result:

CREATE TABLE Result(
    Roll NUMBER(14),
    name VARCHAR(255),
    Class VARCHAR(255),
    FOREIGN KEY (Roll) REFERENCES Stud_Marks (Roll)
);

Procedure

CREATE OR REPLACE PROCEDURE proc_grade
(rollno in number,
 p_roll_no out Stud_Marks.Roll%type,
 p_name out Stud_Marks.name%type,
 p_total out Stud_Marks.total_marks%type)
AS
BEGIN
	SELECT Roll, name, total_marks into p_roll_no, p_name, p_total from Stud_Marks WHERE Roll = rollno;
	IF p_total <= 1500 and p_total >= 990
	THEN
		INSERT INTO Result VALUES (p_roll_no, p_name, 'Distinction');
	ELSE IF p_total <= 989 and p_total >= 900
	THEN
		INSERT INTO Result VALUES (p_roll_no, p_name, 'First Class');
	ELSE IF p_total <= 899 and p_total >= 825
	THEN
		INSERT INTO Result VALUES (p_roll_no, p_name, 'Higher Second Class');
	ELSE
		INSERT INTO Result VALUES (p_roll_no, p_name, 'FAIL');
	END IF;
	END IF;
	END IF;
EXCEPTION
	WHEN no_data_found THEN
		dbms_output.put_line('Rollno ' || rollno || ' is not present!!');
END;
/

Calling Procedure:

DECLARE
	rollno number(14);
	p_roll_no Stud_Marks.Roll%type;
	p_name Stud_Marks.name%type;
	p_total_marks Stud_Marks.total_marks%type;
BEGIN
	rollno := &rollno;
	proc_grade(rollno, p_roll_no, p_name, p_total_marks);
END;
/