MYSQL: Total values except highest and lowest then multiply - php

Question

I have stumbled upon a problem that I can't get my head around.
I have the following topic related tables:
dive(ID,Type,Diver_id,Difficulty,Contest_id)
results(ID,Points,Judge_Id,Dive_id)
divers(ID,Name,Country)
My SELECT statement is meant to list the diver.Name, diver.Country and "total points"
The total points is supposed to be (total += ((dive_total -min -max)*difficulty))
Let's say a diver did 3 dives. Every dive has been rated by ~4 judges and every dive has it's own difficulty. The lowest/highest score per dive is supposed to be removed. Then added together, multiplied with the difficulty and then added to the persons total points.
I have got a list that shows diver.Name, diver.Country and Total.
But the total is only the actual total without the subtraction and multiplication.
Query:
SELECT
divers.Name,
divers.Country,
SUM(results.Points) AS Total
FROM results
INNER JOIN dive
ON results.Dive_id = dive.ID
INNER JOIN divers
ON dive.Diver_id = divers.ID
WHERE dive.Contest_id = '1'
GROUP BY divers.Name
ORDER BY Total DESC
Don't mind the contest_id. It's always '1'.
Please ask for more information if needed. Maybe the question is very silly. I am not a advanced "database guy". Sorry for bad English in advance.
(It is later printed in php/html. Maybe a language combination between mysql and php is a better way to move forward?)

Answer 1

I think what you want is this
SELECT
divers.Name,
divers.Country,
((SUM(results.Points) - MAX(results.Points) - MIN(results.Points)) * dive.Difficulty) AS Total
FROM results
INNER JOIN dive
ON results.Dive_id = dive.ID
INNER JOIN divers
ON dive.Diver_id = divers.ID
WHERE dive.Contest_id = '1'
GROUP BY divers.Name
ORDER BY Total DESC
Otherwise I would just change the SELECT to include:
MIN(results.Points) as maxPoints,
MAX(results.Points) as minPoints,
SUM(results.Points) as totalPoints
and then do the math side of it using PHP

Answer 2

Thank you ode2k! Very helpful. The end result with your code + some GROUP BY
SELECT
divers.Name,
divers.Country,
SUM(results.Points * dive.Difficulty) - MAX(results.Points * dive.Difficulty) - MIN(results.Points * dive.Difficulty) AS Total
FROM results
INNER JOIN dive
ON results.Dive_id = dive.ID
INNER JOIN divers
ON dive.Diver_id = divers.ID
WHERE dive.Contest_id = '1'
GROUP BY divers.Name,
dive.ID,
dive.Difficulty,
results.Dive_id
ORDER BY Total DESC
And then I added the the scores together in PHP to get every name just once.