Informix Guide to SQL: Reference. Describes the Informix system catalog tables, common environment variables that you might need to set, and the data types that Informix Dynamic Server with Universal Data Option supports.
Informix Guide to SQL: Syntax. Contains syntax descriptions for the Structured Query Language (SQL) and Stored Procedure Language (SPL) statements that Informix Dynamic Server with Universal Data Option supports.
Informix Guide to SQL: Tutorial. Includes instructions for using basic and advanced Structured Query Language (SQL) as well as for designing and managing your database.