If you're a programmer or database administrator who uses SQL in your day-to-day work, SQL Pocket Guide, 3rd Edition is the ideal on-the-job reference.The book uses numerous examples to address the language's complexity, and covers key aspects of SQL used in Oracle, DB2, SQL Server, MySQL, and PostgreSQL. That includes the syntax for querying, managing transactions, and making changes to data, as well as SQL functions, type conversion functions & formats, and regular expression syntax.