Erweiterte MySQL Query (Group By und Sort)

Question

Bitte nehmen Sie sich einen Blick auf http://sqlfiddle.com/#!9/3a4d84/1/0

ich diese Tabelle

CREATE TABLE IF NOT EXISTS `data` (
    `id` int(11) NOT NULL, 
    `mdate` char(10) DEFAULT NULL, 
    `customer_id` int(11) NOT NULL, 
    `category` varchar(64) NOT NULL, 
    `quantity` double NOT NULL, 
    `sales` double NOT NULL 
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

INSERT INTO `data` (`id`, `mdate`, `customer_id`, `category`, `quantity`, `sales`) VALUES 
(2, '2015-02-01', 10720, 'Category1', 84.35, 894.24), 
(3, '2015-01-02', 15570, 'Category1', 1000, 1325), 
(4, '2015-01-02', 15570, 'Category6', 1000, 1325), 
(5, '2015-01-05', 17090, 'Category1', 9600, 11671.76), 
(6, '2015-01-05', 10360, 'Category2', 12110, 3981.6), 
(7, '2015-01-05', 10360, 'Category1', 10150, 4828.95), 
(8, '2015-01-06', 16460, 'Category3', 24000, 19656), 
(9, '2015-01-05', 18260, 'Category3', 24000, 17688), 
(10, '2015-01-05', 18260, 'Category2', 25200, 8129.02), 
(11, '2015-01-05', 12570, 'Category1', 500, 6833.5), 
(12, '2015-01-05', 11360, 'Category1', 2000, 1000), 
(13, '2015-01-05', 11360, 'Category6', 23700, 8977.5), 
(14, '2015-01-05', 15740, 'Category2', 26320, 9738.4), 
(15, '2015-01-05', 10170, 'Category2', 24720, 9994.79), 
(16, '2015-01-05', 12220, 'Category1', 4000, 2120), 
(17, '2015-01-05', 13380, 'Category4', 24000, 44880), 
(18, '2015-01-08', 13420, 'Category1', 23959, 23479.82), 
(19, '2015-01-06', 10310, 'Category2', 24900, 13310.54), 
(20, '2015-01-06', 17090, 'Category1', 6100, 2440), 
(21, '2015-01-06', 17090, 'Category2', 2000, 1020), 
(22, '2015-01-06', 17090, 'Category3', 2980, 1281.4), 
(23, '2015-01-06', 17090, 'Category4', 2000, 1707.48), 
(24, '2015-01-06', 10170, 'Category2', 25560, 12141), 
(25, '2015-01-06', 13060, 'Category2', 24440, 9238.32), 
(26, '2015-01-06', 10450, 'Category1', 3000, 2571.07), 
(27, '2015-01-06', 11800, 'Category5', 9000, 163800), 
(28, '2015-01-06', 18260, 'Category2', 25560, 8245.14), 
(29, '2015-01-06', 10170, 'Category2', 25180, 11960.5), 
(30, '2015-01-07', 10280, 'Category3', 21980, 16441.04), 
(31, '2015-01-06', 19230, 'Category2', 17760, 9835.98), 
(32, '2015-01-06', 19470, 'Category1', 6005, 13211), 
(33, '2015-01-06', 18640, 'Category5', 1000, 18200), 
(34, '2015-01-07', 10170, 'Category2', 26060, 12378.5), 
(35, '2015-01-07', 18640, 'Category5', 1000, 18200), 
(36, '2015-01-07', 13880, 'Category5', 500, 2303.93), 
(37, '2015-01-07', 18260, 'Category2', 25360, 8180.63), 
(38, '2015-01-05', 17040, 'Category2', 25080, 10784.4), 
(39, '2015-01-02', 17040, 'Category2', 23340, 10036.2), 
(40, '2015-01-02', 17040, 'Category3', 25500, 10965), 
(41, '2015-01-02', 17040, 'Category7', 24960, 10732.8), 
(42, '2015-01-08', 10720, 'Category1', 25000, 22375), 
(43, '2015-01-07', 10680, 'Category1', 1000, 695), 
(44, '2015-01-08', 16460, 'Category3', 24000, 20136), 
(45, '2015-01-06', 10130, 'Category6', 500, 2950), 
(46, '2015-01-08', 13880, 'Category2', 24000, 41280), 
(47, '2015-01-07', 15180, 'Category3', 2000, 2500), 
(48, '2015-01-06', 11060, 'Category3', 22000, 18480), 
(49, '2015-01-06', 19450, 'Category6', 2000, 11400), 
(50, '2015-01-07', 18150, 'Category4', 19748, 34756.48), 
(51, '2015-01-06', 18690, 'Category1', 1000, 13128.98); 

haben und wenn ich diese Abfrage verwenden

SELECT 
    customer_id, 
    category, 
    sum(quantity) as quantity, 
    sum(sales) as sales 
FROM `data` 
GROUP BY customer_id, category 

ich Ergebnisse wie diese

customer_id  category quantity sales 
10130 Category6 500  2950 
10170 Category2 101520 46474.79 
10280 Category3 21980 16441.04 
10310 Category2 24900 13310.54 
10360 Category1 10150 4828.95 
... 

dann mit PHP, baue ich eine Tabelle wie diese

 | Category1  | Category2  | Category3   
     | quantity | sales | quantity | sales | quantity | sales ... 
------+----------+-------+----------+-------+----------+-------------- 
10360 | 10150 | 4828 |   |  |   | 
10310 |   |  | 24900 | 13310 |   | 
1890 | 80150 | 9828 |   |  | 84822 | 2310 

So können Sie in einer Zeile jede Kategorie quanity und Vertrieb für einen Kunden sehen. Aber jetzt kann ich die Tabelle nicht sortieren ... zum Beispiel nach "Category1 quantity".

Ich mag würde eine MySQL-Abfrage erstellen, dieses Format zu erhalten ("Category1 Menge", "Category1 Umsatz", "Category2 Menge", "Category2 sales" ...) direkt für jeden Kunden. So kann ich Tabelle mit Reihenfolge sortieren nach ...

Ist es möglich? Ich bin mir nicht sicher, wie ich es realisieren soll. Maybee kann ich finden diese Distinct() alle Kategorien und erstellen Sie die Abfrage mit PHP und viele Subselects ... oder?

Vielen Dank sehr Mutch. Mit freundlichen Grüßen ben

---

aktualisieren, okey jetzt habe ich dieses 'Horror' query

SELECT 
    e.customer_id, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category1' AND s.customer_id = e.customer_id) as quantity1, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category1' AND s.customer_id = e.customer_id) as sales1, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category2' AND s.customer_id = e.customer_id) as quantity2, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category2' AND s.customer_id = e.customer_id) as sales2, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category3' AND s.customer_id = e.customer_id) as quantity3, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category3' AND s.customer_id = e.customer_id) as sales3, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category4' AND s.customer_id = e.customer_id) as quantity4, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category4' AND s.customer_id = e.customer_id) as sales4, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category5' AND s.customer_id = e.customer_id) as quantity5, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category5' AND s.customer_id = e.customer_id) as sales5, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category6' AND s.customer_id = e.customer_id) as quantity6, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category6' AND s.customer_id = e.customer_id) as sales6, 
    (SELECT SUM(s.quantity) FROM `data` as s WHERE s.category = 'Category7' AND s.customer_id = e.customer_id) as quantity7, 
    (SELECT SUM(s.sales) FROM `data` as s WHERE s.category = 'Category7' AND s.customer_id = e.customer_id) as sales7 
FROM `data` as e 
Group by e.customer_id 
Order by quantity1 

Ist es möglich, dies zu vermeiden? :) Danke

Answer 1

Wie ich verstehe, versuchen Sie, Ihre Tabelle zu konvertieren, die category Zeilenwerte in Spalten konvertiert. Leider hat MySQL keine solchen Funktionen (wie T-SQL). Es ist jedoch ein häufiges Problem und es ist gut diskutiert here. Also ich würde Ihre Abfrage mit CASE anstelle von Unterabfragen wie folgt umschreiben:

SELECT 
    e.customer_id, 
    (SUM(CASE WHEN e.category = 'Category1' THEN e.quantity END)) as quantity1, 
    (SUM(CASE WHEN e.category = 'Category1' THEN e.sales END)) as sales1, 
    (SUM(CASE WHEN e.category = 'Category2' THEN e.quantity END)) as quantity2, 
    (SUM(CASE WHEN e.category = 'Category2' THEN e.sales END)) as sales2, 
    (SUM(CASE WHEN e.category = 'Category3' THEN e.quantity END)) as quantity3, 
    (SUM(CASE WHEN e.category = 'Category3' THEN e.sales END)) as sales3, 
    (SUM(CASE WHEN e.category = 'Category4' THEN e.quantity END)) as quantity4, 
    (SUM(CASE WHEN e.category = 'Category4' THEN e.sales END)) as sales4 
    # and so on 
FROM `data` as e 
Group by e.customer_id 
Order by quantity1