1. In what scenarios would you advise me not to use ReLU in my hidden layers?

2. Table A has values 1, 1, 0, 0, null, and Table B has values 1, 0, null, null. What are the resultant rows for all types of joins?

3. Given an integer n, return true if n is a prime number, otherwise return false. Implement an optimal approach.

4. What are RANK, DENSE_RANK, and ROW_NUMBER functions?

5. How do you swap variables if two variables are given?