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I have no formal training in GIS and have learned on the fly with ArcGIS 9.3 at work and have been dabbling with QGIS on my own time for my business. Is there any resource recommendations ingeneral for getting past the basics of GIS and going into the deep dark secrets? Specifically in relation to experession coding for labeling, queries, etc.

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Some useful stuff here for 1.8 and older

http://hub.qgis.org/projects/quantum-gis/wiki/How_do_I_do_that_in_QGIS

http://hub.qgis.org/wiki/quantum-gis/Calculating_field_values

http://hub.qgis.org/wiki/quantum-gis/List_of_Field_Calculator_Functions

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Just note the list of Field Calculator Function is now out of date. All functions that can be used will be listed in the expression builder. –  Nathan W Jan 8 '13 at 22:00
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Underdark has composed some nice examples for labeling expressions:

Easier Conditional Labels in QGIS

Here are some helpful links for querying:

Query Attributes

Working with Attribute Table - Basic Queries

If you are interested in coding then you can start with this resource:

pyQGIS Developer Cookbook

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a nice blog with good QGIS tutorials : http://woostuff.wordpress.com/

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