====AddQuery====

This is a function of the [[class_LagCorrectedQuery|LagCorrectedQuery]] class.

===Description===

This adds an AQL query that should be run when you [[lcq_Execute|Execute]] the finished request.

===Parameters===

^Parameter^Type^Meaning^
|query|string|The AQL query to run|
|lag|float|The amount of lag to apply to this query|

===Returns===

Nothing

===Usage===

You normally add a single query for each different //level of lag// in your system.

This normally translates into having a distinct query for each asset - but there may be times when some assets are part of the same system and share the same amount of lag.

For example, **Machine D** is at the end of the line - we add a query for the properties on that asset, but it doesn't need any value for //lag//.

**Machine C** is 50m away, so we create a query specifically for it with a //lag// of 50.

**Machine A** and **Machine B** are 100m away, so you query all of the points for both of those machines in a single query, with //lag// set to 100.

===Choosing a Lag===

Since you usually [[building backwards|build these queries backwards]], there's often either **no lag** or only a **small amount of lag** from the [[end asset|end asset]] found at the end of your process line. Your lag value increases as you get close to the 'start' of the process.

The lag you choose for each query should be the [[distance|distance]] between that asset and your 
[[end asset|end asset]].