Functions
- Explain the use of CASE in SQL.
- How can you use GROUP_CONCAT() function in SQL?
- How do you concatenate two strings in SQL?
- How do you find the second-highest salary in SQL?
- How do you use COALESCE in SQL?
- What does the MOD function do in SQL?
- What is the difference between COUNT and SUM functions?
- What is the difference between COUNT(*) and COUNT(column)?