Please provide substantive responses to the following items:
(a) What are three advantages to using SQL?
(b) What are challenges to using SQL?
(c) By using an example, explain how SQL provides the ability to use set operations.
(d) By using an example, describe an advanced function of SQL.
Your assignment should include at least five (5) reputable sources, written in APA Style, and 500-to-650-words.