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Help understanding a query

Question asked by MCline19 on Jan 23, 2020
Latest reply on Jan 24, 2020 by MCline19

Looking for a little help understanding what the Where clause of this SQL query is doing. This is used to define a query layer in an ArcPro map.  DBMS is postgresql


SELECT, a.valid_date,,,, a.elevation, a.mph, a.local_time, a.shape

   obs.gusts AS a



I understand that the last line is a cast function, but I do not understand what the "r" represents and how it's filtering the data.


Thanks in advance