[Qgis-user] Looking for Intro PostGIS SQL Tutorial

[Dennis M. Linton]

Can anyone recommend/suggest any introductory tutorials on using polygon
points or bounding boxes in QGIS SQL queries.  I have done a lot
Googling and have found a few but the instructions are quite cryptic and
in trying a few examples I do not seem to be able to obtain any results.
My queries do not throw errors but neither do they return anything.

Thanks in advance.
-- 
Dennis M. Linton, P.Eng.





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