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Jeemin Sim (Work Log) (view source)
Revision as of 09:55, 19 September 2017
, 09:55, 19 September 2017→9/19/2017 TUESDAY9AM-10:40AM & 1PM-2:20PM
====9/19/2017 TUESDAY''9AM-10:40AM & 1PM-2:20PM''====
* Useful functions for spatial joins:** '''sum(expression)''': aggregate to return a sum for a set of records
count(expression): aggregate to return the size of a set of records
ST_Area(geometry) returns the area of the polygons
