This technique not only helps with the puzzle at hand, but help develop the mindset needed to solve many difficult SQL puzzles you face every day. * Using the proven format of puzzles and solutions to provide a display, user-friendly practical SQL programming problem - many that will help users resolve their own problems. * New edition features: - Many new puzzles added! - Dozens of new solutions to the puzzle, and using the features in SQL-99 - Code edited to conform with the rules of SQL STYLE - New chapter on temporal query puzzle - New chapter on common misconceptions about SQL and RDBMS that leads to problems