Added queries for assignment A4.

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

@@ -1,75 +1,91 @@
-## Creating tables & inserting data
+## Creating tables
 
-Student marks:
 ```sql
-CREATE TABLE Stud_Marks(
-    Roll NUMBER(14),
-    name VARCHAR(255),
-    total_marks NUMBER(14),
-    PRIMARY KEY(Roll)
+CREATE TABLE Borrower (
+  Roll_no NUMBER(15),
+  Name VARCHAR(255),
+  DateOfIssue DATE,
+  NameOfBook VARCHAR(255),
+  Status VARCHAR(255),
+  PRIMARY KEY(Roll_no)
 );
 
-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);
+CREATE TABLE Fine (
+  Roll_no NUMBER(15),
+  DateOfReturn DATE,
+  Amount NUMBER(15),
+  FOREIGN KEY(Roll_no) REFERENCES Borrower(Roll_no)
+);
 
 ```
 
-Result:
+## Inserting data
+
 ```sql
-CREATE TABLE Result(
-    Roll NUMBER(14),
-    name VARCHAR(255),
-    Class VARCHAR(255),
-    FOREIGN KEY (Roll) REFERENCES Stud_Marks (Roll)
-);
+INSERT INTO Borrower (Roll_no, Name, DateOfIssue, NameOfBook, Status) values (1, 'Ayush Kalaskar', TO_DATE('2024-07-28','YYYY-MM-DD'), 'DBMS', 'I');
+
+INSERT INTO Borrower (Roll_no, Name, DateOfIssue, NameOfBook, Status) values (2, 'Himanshu Patil', TO_DATE('2024-07-01','YYYY-MM-DD'),'IOT', 'I');
+
+INSERT INTO Borrower (Roll_no, Name, DateOfIssue, NameOfBook, Status) values (3, 'Kshitij', TO_DATE('2024-08-05','YYYY-MM-DD'), 'TOC', 'I');
 
 ```
 
 ## 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;
+  p_nameofbook VARCHAR(255);
+  p_rollno NUMBER(15) := 1;
+  p_dateofissue DATE;
+  currentdate DATE;
+  noofdays NUMBER(15);
+  amount NUMBER(15);
+  nodata EXCEPTION;
+
 BEGIN
-	rollno := &rollno;
-	proc_grade(rollno, p_roll_no, p_name, p_total_marks);
+  p_nameofbook := '&p_nameofbook';
+  currentdate := SYSDATE;
+
+  IF p_rollno <= 0 THEN
+    RAISE nodata;
+  END IF;
+
+  SELECT DateOfIssue
+  INTO p_dateofissue
+  FROM Borrower
+  WHERE Roll_no = p_rollno AND NameOfBook = p_nameofbook;
+
+  SELECT TRUNC(SYSDATE) - p_dateofissue
+  INTO noofdays
+  FROM dual;
+
+  DBMS_OUTPUT.PUT_LINE('No of days: ' || noofdays);
+  IF (noofdays > 30) THEN
+    amount := noofdays * 50;
+  ELSIF (noofdays >= 15 AND noofdays <= 30) THEN
+    amount := noofdays * 5;
+  ELSE
+    amount := 0;
+  END IF;
+
+  IF amount > 0 THEN
+    INSERT INTO Fine (Roll_no, DateOfReturn, Amount)
+    VALUES (p_rollno, SYSDATE, amount);
+  END IF;
+
+  IF amount > 0 THEN
+    UPDATE Borrower
+    SET Status = 'R'
+    WHERE Roll_no = p_rollno;
+  END IF;
+
+EXCEPTION
+  WHEN nodata THEN
+    DBMS_OUTPUT.PUT_LINE('Roll number or book name not found.');
+  WHEN NO_DATA_FOUND THEN
+    DBMS_OUTPUT.PUT_LINE('No entry found for the provided roll number and book name.');
+  WHEN OTHERS THEN
+    DBMS_OUTPUT.PUT_LINE('An error occurred: ' || SQLERRM);
+
 END;
 /