What is a primary key?

What is a foreign key?

What is de-normalization?

What is full functional dependency?

What is the standard normal form for most Online Transaction Processing (OLTP) databases?

What is trivial functional dependency?

What are the types of normalization?

What is the difference between String, String Buffer and StringBuilder?

Why String is immutable or final in Java?

How to split String in java?

Write a function to find out longest palindrome in a given string?