Mam tablice:

[SQL] pobierz, plaintext 
INSERT INTO `x_deals` (`id`, `loc`, `id_u`, `amount`, `sell`, `buy`, `rate`, `date`) VALUES
(1, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(2, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(3, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(4, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(5, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(6, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(7, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(8, 'pl', 1, 50000, 'PLN', 'EUR', 3.1234, '2009-12-25 09:48:10'),
(9, 'pl', 1, 50000, 'PLN', 'EUR', 5.54, '2009-12-25 09:48:10'),
(10, 'pl', 1, 50000, 'PLN', 'EUR', 3.4234, '2009-12-25 09:48:10'),
(11, 'pl', 1, 50000, 'PLN', 'EUR', 3.11234, '2009-12-25 09:48:10'),
(12, 'pl', 1, 12000, 'PLN', 'EUR', 3.2134, '2009-12-25 09:48:10'),
(13, 'pl', 1, 5400, 'PLN', 'EUR', 3.12124, '2009-12-25 09:48:10'),
(14, 'pl', 1, 504200, 'PLN', 'EUR', 3.12213, '2009-12-25 09:48:10'),
(15, 'pl', 1, 3120, 'PLN', 'EUR', 3.12213, '2009-12-25 09:48:10');
[SQL] pobierz, plaintext 

Wynik:

EUR / PLN 3.12213 504200
EUR / PLN 3.11234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.1234 50000
EUR / PLN 3.4234 50000
EUR / PLN 5.54 50000
EUR / PLN 3.2134 12000
EUR / PLN 3.12124 5400
EUR / PLN 3.12213 3120

Chce natomiast, aby zsumowac wszystkie te liczby, ktore maja ten sam kurs w jedno. Jak to zrobic? Da sie to zrobic na MySQL? Jednak wolalbym rozwiazanie w php.

to powinno Cię naprowadzić:

[PHP] pobierz, plaintext 
 
while($row = mysql_fetch_array($select)) {
$count['rate'][] = $row['rate'];
$count['amount'][] = $row['amount'];
}
 
print_r(array_count_values($count['rate'])); 
[PHP] pobierz, plaintext 

[SQL] pobierz, plaintext 
SELECT id, loc, id_u, amount, sell, buy, rate, date, sum(amoun)  FROM x_deals GROUP BY rate
[SQL] pobierz, plaintext