input: Write a function to determine if it is possible to create a HTML page that displays a table of contents from the data stored in a database. If it is possible return "Yes" else return "No".
  assert can_create_toc_from_db("MySQL") == "Yes"
  assert can_create_toc_from_db("PostgreSQL") == "Yes"
  assert can_create_toc_from_db("NoSQL") == "No"
  assert can_create_toc_from_db("") == "No"
output: def can_create_toc_from_db(db_type):
      if db_type in ["MySQL", "PostgreSQL"]:
          return "Yes"
      else:
          return "No"