雙選窄條結果

我想從表格中選擇視圖，增加和增加百分比，但只顯示唯一的ID。我可以得到我想要的信息，但是我需要並且無法縮小結果。雙選窄條結果

，我有以下數據：

+------------+------------+-------+-------+ 
| datum  | youtube_id | views | likes | 
+------------+------------+-------+-------+ 
| 2012-10-07 |  123456 | 100 | 100 | 
| 2012-10-07 |  98765 | 200 | 200 | 
| 2012-10-08 |  123456 | 150 | 150 | 
| 2012-10-08 |  98765 | 300 | 300 | 
| 2012-10-09 |  123456 | 300 | 300 | 
| 2012-10-09 |  98765 | 500 | 500 | 
+------------+------------+-------+-------+

而且下面的SQL語句：

SELECT 
id, 
startcount, 
endcount, 
(endcount - startcount)increasing, 
((endcount - startcount)/(startcount) *100)percentChange 
FROM (SELECT youtube_id AS id, views AS startcount 
    FROM charts 
    WHERE datum = '2012-10-08')startRange, 
(SELECT views AS endcount 
FROM charts 
WHERE datum = '2012-10-09')endRange

這給了我以下結果：

+--------+------------+----------+------------+---------------+ 
| id  | startcount | endcount | increasing | percentChange | 
+--------+------------+----------+------------+---------------+ 
| 123456 |  150 |  300 |  150 |  100.0000 | 
| 98765 |  300 |  300 |   0 |  0.0000 | 
| 123456 |  150 |  500 |  350 |  233.3333 | 
| 98765 |  300 |  500 |  200 |  66.6667 | 
+--------+------------+----------+------------+---------------+

預期的結果將是：

+--------+------------+----------+------------+---------------+ 
| id  | startcount | endcount | increasing | percentChange | 
+--------+------------+----------+------------+---------------+ 
| 123456 |  150 |  300 |  150 |  100.0000 | 
| 98765 |  300 |  500 |  200 |  66.6667 | 
+--------+------------+----------+------------+---------------+

我一直在尋找一個團隊或一個加入，但無法弄清楚這一點，已經重做了幾天，但現在自己跑到一個循環。

如果有人能指引我正確的方向或幫助我，這將是偉大的！

來源

2012-10-14 user1745054

SQL Fiddle

SELECT 
    c1.youtube_id id, 
    c1.views startcount, 
    c2.views endcount, 
    c2.views - c1.views increasing, 
    (c2.views - c1.views) * 100/c1.views percentChange 
FROM 
    charts c1 
    inner join 
    charts c2 on c1.youtube_id = c2.youtube_id 
WHERE 
    c1.datum = '2012-10-08' and c2.datum = '2012-10-09'

編輯：改變了增加

來源

2012-10-14 15:31:44

謝謝你的真快和正確的答案。我現在瞭解內部連接的工作原理。謝謝！ – user1745054

雙選窄條結果

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