MaptimeNYC recently hosted an event at CartoDB's New York office, bringing together mappers from across the city to share ideas and build community around mapping. The group showcased a skill or technique presented by a fellow mapper, then transitioned into problem-solving working sessions that tackled various aspects of developing and mapping technologies. The session featured part 2 of a series on SQL using PostGIS, providing handy queries for connecting dots with lines, finding points within geographic areas, and visualizing differences in data. These queries utilize functions such as ST_Makeline, ST_Contains, CDB_LatLng, and lag(). The event aimed to create a safe space for mappers to experiment, make mistakes, and learn from each other's experiences.