ABOUT THE AUTHOR Joe Celko is a noted consultant and lecturer, and one of the most-read SQL authors in the world. He is well known for his 10 years of service on the ANSI SQL standards committee, his column in Intelligent Enterprise magazine (which won several Reader’s Choice Awards), and the war stories he tells to provide real-world insights into SQL programming. His best- selling books include Joe Celko’s SQL for Smarties: Advanced SQL Program- ming, second edition; Joe Celko’s SQL Puzzles and Answers; and Joe Celko’s Trees and Hierarchies in SQL for Smarties. . provide real-world insights into SQL programming. His best- selling books include Joe Celko’s SQL for Smarties: Advanced SQL Program- ming, second edition; Joe Celko’s SQL Puzzles and Answers; . noted consultant and lecturer, and one of the most-read SQL authors in the world. He is well known for his 10 years of service on the ANSI SQL standards committee, his column in Intelligent. second edition; Joe Celko’s SQL Puzzles and Answers; and Joe Celko’s Trees and Hierarchies in SQL for Smarties.