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# StreamSQL Guide

### Deprecated Documentation

Starting with StreamBase 10.0, the StreamSQL language is deprecated, and is not supported for building new StreamBase solutions. Existing StreamSQL modules are supported in an application you are porting from a previous StreamBase release.

This StreamSQL Guide is provided on disk for reference when maintaining previously written StreamSQL modules, but has not been changed at all from its StreamBase 7 edition. The StreamSQL Guide is not linked from the menus of the StreamBase Studio Help system.

TIBCO StreamSQL is the TIBCO StreamBase text-based language for writing applications to query streams of data. StreamSQL applications are analogous to graphical EventFlow applications, but are stored in files with an `ssql` extension.

This guide is primarily a language reference that describes how to use the StreamSQL language elements. For general concepts and primitive operations common to both EventFlow and StreamSQL applications, look for references to appropriate topics in the Authoring Guide.

### Reference Pages

StreamBase Environment Variables
StreamBase Java Properties
StreamBase Expression Language Functions