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SQL programmingYou can use the HCL Informix® implementation of the SQL language to develop applications for Informix® database servers.
Guide to SQL: Syntax
Overview of SQL syntax These topics provide an overview about how to use the SQL statements, SPL statements, and syntax segments.
ANSI/ISO Compliance and Extensions

ANSI/ISO Compliance and Extensions

Lists that follow show statements that match the ANSI SQL-92 standard at the entry level, statements that are ANSI compliant but include Informix® extensions, and statements that are Informix extensions to the ANSI/ISO standard.