BQL is already a powerful tool for querying several different data sources in Niagara including component data, alarms, and histories. There is some documentation available in the docDeveloper module that is worth a read. It includes a nice high level view of BQL syntax and lots of examples. While examples are always nice, and more are always better, you can really only get so far with examples. Eventually you'll come across a problem that isn't covered by an example and if you don't understand how it works, you're out of luck. My goal here is to provide a better understanding of the mechanics of how a BQL query is evaluated so that when you have that report you're building that keeps you coming back to the brute force approach or pulling your hair out, you will naturally think BQL instead.

The Niagara community is growing fast and it's made up of some pretty diverse groups including systems integrators, app developers, appliance developers, and end users, just to name a few. With all of these creative people in the mix, the Niagara Framework has truly taken on a life of its own. The entire purpose of Niagara Central is to support the growing community and bring people together to facilitate exchange of knowledge and ideas.