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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.
Create and use SPL routines
Expressions in SPL routines

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.

Expressions in SPL routines

You can use any SQL expression in an SPL routine, except for an aggregate expression. The Informix® Guide to SQL: Syntax provides the complete syntax and descriptions for SQL expressions.

The following examples contain SQL expressions:

var1
var1 + var2 + 5
read_address('Miller')
read_address(lastname = 'Miller')
get_duedate(acct_num) + 10 UNITS DAY
       fname[1,5] || ''|| lname '(415)' || get_phonenum(cust_name)