Hello,
> This query executes very fast...
>
[...]
>
> While this query takes over 30 seconds to execute:
>
[...]
>
> The only difference between the queries is:
> p.MLS_Timestamp >= subdate(timestamp,125)   is replaced by
> adddate(p.MLS_Timestamp, 125) >= timestamp
>
in the first case there is one subtraction for the query,
while in the second case there is one addition for every candidate row.
So the results should be quite expected (as subtraction and addition take 
about probably the same time).

Peter Willadt
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