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this query SELECT SUM(s.msg_sent_datetime - r.date_received) AS difference
returns -743726381625992.000000
but if i add on WHERE (s.msg_sent_datetime - r.date_received) > 0
it returns: 343435413.000000
I thought the 0 value rows would have no effect on a sum?
also, what is up with the .000000
Your conditional statement also ignores negative values i.e. if (s.msg_sent_datetime – r.date_received) < 0, the row is ignored. On the other hand, if that condition didn’t exist (like in your original query), you’re also adding the negative numbers.