Housing.com interview question

1. Design URL shortening service 2. composite index in RDBMS 3. Compound Index in NoSQL 4. When to use NoSQL and when to use RDMS 5. Design database for Banking System 6. How row locking works in database 7. find pair in an array for a given sum k 8. Multithreading 9 Implement your own ThreadPool 10. PriorityQueue in Java 11. Query to find Nth highest salary in a table employee