--- Chris Eich <[EMAIL PROTECTED]> wrote:
> I realize that but thought that device_id would be included because of the
> d.device_id=dpi.device_id term. What am I missing?

dpi.device_id is not constant.

You'd be better off with this index for your query:

 CREATE INDEX dpi3 ON device_perf_interval(
   interval_type,
   interval_duration
 );



 
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