如何總結這些分組的行還通過

Question

有一個順序試想一下，這是我表中的數據：

Amount/ Number /Type 
100/ 1.2/A 
120/1.2 /A 
130/ 1.1/A 
90/0.3/A 
50/ 2.4/B 
150/1.9 /B 
150/1.9/B 

我想這個數據在兩組一個A型，一個是B型。然後，這兩個羣體中，我希望他們通過價格排序，升一降的其他。這個我可以這樣做：

(SELECT * FROM `table` WHERE `type`='A' GROUP BY `number` LIMIT 10) 
UNION ALL 
(SELECT * FROM `table` WHERE `type`='b' GROUP BY `number` LIMIT 15) ORDER BY `type`), 
(CASE WHEN `type`='A' THEN `number` END) ASC, 
(CASE WHEN `type`='B' THEN `number` END) DESC"; 

但是問題是我想加起來類型相同數量的..所以1.2我會得到220/1.2/A，而是與我的查詢我只是得到100 /1.2/A ...如何合計相同數量和相同類型的數字金額？

感謝

Answer 1

這是您要查詢：

(SELECT sum(amount) as amount, number, type 
FROM `table` 
WHERE `type`='A' 
GROUP BY `number` LIMIT 10 
) 
UNION ALL 
(SELECT sum(amount) as amount, number, type 
FROM `table` 
WHERE `type`='b' 
GROUP BY `number` LIMIT 15 
) 
ORDER BY `type`, 
      (CASE WHEN `type`='A' THEN `number` END) ASC, 
      (CASE WHEN `type`='B' THEN `number` END) DESC; 

作爲一個說明：這將返回的10行的group by後15行乙的。我猜這就是你真正想要的。

此外，group by會自動number訂購。如果你想有一個隨機的順序，再加入group by rand()到limit之前每個子查詢。

Answer 2

你在找這個？

SELECT SUM(amount) amount, number, type 
    FROM table1 
GROUP BY type, number 
ORDER BY type, 
     CASE WHEN `type`='A' THEN `number` END ASC, 
     CASE WHEN `type`='B' THEN `number` END DESC; 

輸出：

| AMOUNT | NUMBER | TYPE | 
-------------------------- 
|  90 | 0.3 | A | 
| 130 | 1.1 | A | 
| 220 | 1.2 | A | 
|  50 | 2.4 | B | 
| 300 | 1.9 | B | 

SQLFiddle

UPDATE：如果您需要限制每種類型的使用這種源的記錄數。 注意，當您使用LIMIT，你必須明確說明ORDER BY因爲行的順序不保留。

SELECT SUM(amount) amount, number, type 
FROM (
    (SELECT * FROM table1 WHERE type = 'A' ORDER BY number LIMIT 10) 
    UNION ALL 
    (SELECT * FROM table1 WHERE type = 'B' ORDER BY number LIMIT 15) 
) q 
GROUP BY type, number 
ORDER BY type, 
     CASE WHEN `type`='A' THEN `number` END ASC, 
     CASE WHEN `type`='B' THEN `number` END DESC; 

SQLFiddle

Answer 3

像這樣的事情吧？

select Number,Type,sum(Amount) from x group by Number,Type 
+--------+------+--------+ 
| Number | Type | sum(a) | 
+--------+------+--------+ 
| 0.3 | A |  90 | 
| 1.1 | A | 130 | 
| 1.2 | A | 220 | 
| 1.9 | B | 300 | 
| 2.4 | B |  50 | 
+--------+------+--------+ 
5 rows in set (0.00 sec)