Added content.

- Notes
- Practical (Databases, Handouts, Queries, Softcopies, Write-ups)
- Question Papers
- DISCLAIMER file and motto
Lastly, updated README file.

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

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+# Database Queries for Assignment-A4
+
+## Creating tables
+
+```sql
+CREATE TABLE Borrower (
+  roll_no INT,
+  issuer_name VARCHAR(255),
+  issue_date DATE,
+  book_name VARCHAR(255),
+  status VARCHAR(1),
+  PRIMARY KEY (roll_no)
+);
+
+CREATE TABLE Fine (
+  roll_no INT,
+  return_date DATE,
+  amt INT,
+  FOREIGN KEY (roll_no) REFERENCES Borrower (roll_no)
+);
+
+```
+
+## Inserting data
+
+```sql
+INSERT INTO Borrower VALUES (1, 'Kalas', TO_DATE('2024-10-19', 'YYYY-MM-DD'), 'DBMS', 'I');
+INSERT INTO Borrower VALUES (2, 'Himanshu', TO_DATE('2024-10-01', 'YYYY-MM-DD'), 'TOC', 'I');
+INSERT INTO Borrower VALUES (3, 'MEPA', TO_DATE('2024-10-25', 'YYYY-MM-DD'), 'IoT', 'I');
+INSERT INTO Borrower VALUES (4, 'Kshitij', TO_DATE('2024-10-29', 'YYYY-MM-DD'), '1984', 'I');
+
+```
+
+## Procedure
+
+```sql
+DECLARE
+  p_roll NUMBER; -- specify roll number here since Live SQL cannot take input from user
+  -- Eg. p_roll NUMBER := 1; will take roll number 1 as input
+  p_book VARCHAR2(255); -- specify book name here since Live SQL cannot take input from user
+  -- Eg. p_book VARCHAR2(255) := 'DBMS';
+  p_issueDate DATE;
+  totalDays NUMBER;
+  currentDate DATE;
+  fineAmt NUMBER;
+  nodata EXCEPTION;
+
+BEGIN
+  -- Check if roll number is valid
+  IF (p_roll <= 0) THEN
+    RAISE nodata;
+  END IF;
+
+  -- Storing values from table in variables
+  SELECT issue_date INTO p_issueDate FROM Borrower WHERE roll_no = p_roll AND book_name = p_book;
+
+  -- Getting the total days since book issue
+  SELECT TRUNC(SYSDATE) - p_issueDate INTO totalDays FROM dual;
+
+  -- Calculating fine
+  IF (totalDays > 30) THEN
+    fineAmt := totalDays * 50; -- Rs. 50 per day for total days greater than 30
+  ELSIF (totalDays BETWEEN 15 AND 30) THEN
+    fineAmt := totalDays * 5; -- Rs. 5 per day for total days between 15 and 30
+  ELSE
+    fineAmt := 0;
+  END IF;
+
+  -- Inserting data into Fine table
+  IF fineAmt > 0 THEN
+    DBMS_OUTPUT.PUT_LINE('Roll no. ' || p_roll || ' has been fined Rs. ' || fineAmt || ' for being ' || totalDays || ' days late.');
+    INSERT INTO Fine VALUES (p_roll, SYSDATE, fineAmt);
+  ELSE
+    DBMS_OUTPUT.PUT_LINE('Roll no. ' || p_roll || ' does not have to pay any fine.');
+  END IF;
+  UPDATE Borrower SET status = 'R' WHERE roll_no = p_roll AND book_name = p_book;
+
+EXCEPTION
+  WHEN nodata THEN
+    DBMS_OUTPUT.PUT_LINE('Roll number' || p_roll || ' not found.');
+  WHEN OTHERS THEN
+    DBMS_OUTPUT.PUT_LINE('An error occured. Error: ' || SQLERRM);
+
+END;
+/
+```

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

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+# Queries for Assignment-A5
+
+> [!NOTE]
+> Problem Statment: Write a PL/SQL code block to calculate the area of a circle for a value of radius varying from 5 to 9. Store the radius and the corresponding values of calculated area in an empty table named areas, consisting of two columns, radius and area.
+> Note: Instructor will frame the problem statement for writing PL/SQL block in line with above statement.
+
+## Creating table
+
+```sql
+CREATE TABLE areas (
+  radius INT NOT NULL,
+  area INT
+);
+
+```
+
+## Procedure
+
+```sql
+DECLARE
+  v_radius NUMBER; -- specify radius here since Live SQL cannot take input from user
+  -- Eg. v_radius NUMBER := 5 will take radius 5 as input
+  calcedArea NUMBER;
+  invalidData EXCEPTION;
+  psError EXCEPTION;
+
+BEGIN
+  -- if radius is less than 0, raise exception
+  IF (v_radius < 0) THEN
+    RAISE invalidData;
+  ELSIF (v_radius NOT BETWEEN 5 AND 9) THEN
+    RAISE psError;
+  END IF;
+
+  -- calc area
+  calcedArea := 3.14 * v_radius * v_radius;
+  DBMS_OUTPUT.PUT_LINE('For radius ' || v_radius || ' cm, the area is ' || calcedArea || ' sq. cm.');
+
+  -- add data to table
+  INSERT INTO areas VALUES (v_radius, calcedArea);
+  DBMS_OUTPUT.PUT_LINE('Inserted values to areas database.');
+
+EXCEPTION
+  WHEN invalidData THEN
+    DBMS_OUTPUT.PUT_LINE('Radius cannot be less than 0 cms. Please enter a valid value.');
+  WHEN psError THEN
+    DBMS_OUTPUT.PUT_LINE('Problem statement requires the radius to be between 5 and 9 cms.');
+  WHEN OTHERS THEN
+    DBMS_OUTPUT.PUT_LINE('An error occured. Error: ' || SQLERRM);
+
+END;
+/
+
+```