Added queries for a4

Practical/Assignment-A4+A5/Queries-A4.md

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+## Creating tables & inserting data
+
+Student marks:
+```sql
+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:
+```sql
+CREATE TABLE Result(
+    Roll NUMBER(14),
+    name VARCHAR(255),
+    Class VARCHAR(255),
+    FOREIGN KEY (Roll) REFERENCES Stud_Marks (Roll)
+);
+
+```
+
+## Procedure
+```sql
+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:
+```sql
+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;
+/
+
+```