Master the art of SQL with this handy tool. Simply input the data type and database name and watch as it crafts an optimized SQL query for you, complete with comments and performance improvement suggestions.
Design a comprehensive SQL query that retrieves Data Type from the Database Name database. Ensure the query accounts for potential null values and is optimized for performance. Include comments within the SQL code explaining each step of the query process. Additionally, suggest indexes or other performance improvements that could be applied to the database to optimize this query further.