Joe Celko served 10 years on ANSI/ISO SQL Standards Committee and contributed to the SQL-89 and SQL-92 Standards. Mr. Celko is author a series of books on SQL and RDBMS for Elsevier/MKP. He is an independent consultant based in Austin, Texas. He has written over 1200 columns in the computer trade and academic press, mostly dealing with data and databases.
...a must-read book for any SQL programmer, covering advanced topics in an understandable way...aimed at taking experienced SQL programmers and giving them the extras to make them experts. --I Programmer, February 2015