> Anyway, given your code, it looks like we would not expect any results in 
>> the intersection of the two Rows objects, as the conditions of each query 
>> are mutually exclusive (i.e., "waypoint" either equals X or Y). Of course, 
>> if X == Y, then the two sets of Rows are identical, but I assume that isn't 
>> generally the case.
> A segment row will only have one waypoint, but multiple segment rows may 
> have the same parent run.  I chose to make the run table very simple (and 
> in particular, not to have a list of children), but the segment table 
> points upward to the run.

Your code doesn't show which columns are selected -- I suppose you are 
saying the "waypoint" column is *not *selected.


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