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SQL programming
You can use the HCL Informix® implementation of the SQL language to develop applications for Informix database servers.
Guide to SQL: Tutorial
The Informix® Guide to SQL: Tutorial shows how to use basic and advanced structured query language (SQL) to access and manipulate the data in your databases. It discusses the data manipulation language (DML) statements as well as triggers and stored procedure language (SPL) routines, which DML statements often use.
Functions in SELECT statements
Functions in SELECT statements
Other functions

SQL programming
You can use the HCL Informix® implementation of the SQL language to develop applications for Informix database servers.
- Guide to SQL: Syntax
- Guide to SQL: Reference
  The Informix® Guide to SQL: Reference contains the reference information for the system catalog tables, data types, and environment variables of the HCL Informix dialect of the SQL language, as implemented in HCL Informix. These topics also include information about the stores_demo, sales_demo, and superstore_demo databases that are included with HCL Informix.
- Guide to SQL: Tutorial
  The Informix® Guide to SQL: Tutorial shows how to use basic and advanced structured query language (SQL) to access and manipulate the data in your databases. It discusses the data manipulation language (DML) statements as well as triggers and stored procedure language (SPL) routines, which DML statements often use.

Other functions

You can also use the LENGTH, USER, CURRENT, SYSDATE, and TODAY functions anywhere in an SQL expression that you would use a constant. In addition, you can include the DBSERVERNAME function in a SELECT statement to display the name of the database server where the current database resides.

You can use these functions to select an expression that consists entirely of constant values or an expression that includes column data. In the first instance, the result is the same for all rows of output.

In addition, you can use the HEX function to return the hexadecimal encoding of an expression, the ROUND function to return the rounded value of an expression, and the TRUNC function to return the truncated value of an expression. For more information on the preceding functions, see the Informix® Guide to SQL: Syntax.