UNIX has become the leading operating system for the commercial environment. INFORMIX-SQL is the bestselling database for UNIX machines, and is also available for Xenix, DOS, and OS/2. This second edition of “Using INFORMIX-SQL” has been completely updated to cover all of the features of the latest version 4.00. Assuming only a basic understanding of the concepts of relational database systems, “Using INFORMIX-SQL” will appeal to a broad DP managers and personnel, database programmers, MIS managers and database administrators. Key INFORMIX-SE and INFORMIX-ONLINE, the database engines, are now treated separately from INFORMIX-SQL, a running example is used throughout the book to illustrate key concepts, and numerous exercises are provided for hands-on-learning, many with complete solutions and practical hints.