I have a database called tnews. Inside that database, I have a table called eb_users. Inside that table I have a row called user_name. I need to create a function that takes a string and compares it to every value in the row eb_users. Then, I need it to return false an instance of that string exists (being caps insensitive), and true if the string is unique. I have already connected to the database. Thanks in advance.