Q4: Unnamed PL/SQL code block: Use of Control structure and Exception handling is mandatory. Suggested Problem statement: Consider Tables: 1. Borrower (Roll_no, Name, Date_of_Issue, Name_of_Book, Status) 2. Fine (Roll_no, Date, Amt) • Accept Roll_no and Name_of_Book from user. • Check the number of days (from Date_of_Issue). • If days are between 15 to 30 then fine amount will be Rs 5 per day. • If no. of days > 30, per day fine will be Rs 50 per day and for days less than 30, Rs. 5 per day. • After submitting the book, status will change from I to R. • If condition of fine is true, then details will be stored into fine table. • Also handles the exception by named exception handler or user define exception handler. OR MongoDB – Aggregation and Indexing: • Design and Develop MongoDB Queries using aggregation and indexing with suitable example using MongoDB. MongoDB – Map-reduce operations: • Implement Map-reduce operation with suitable example using MongoDB.