我想从表格中选择视图、增加和百分比增加,但只显示唯一 ID。我可以得到我想要的信息,但它比我需要的更多,不能缩小结果。
我有以下数据:
+------------+------------+-------+-------+
| 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 |
+------------+------------+-------+-------+
以及下面的sql语句:
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
这给了我以下结果:
+--------+------------+----------+------------+---------------+
| 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 |
+--------+------------+----------+------------+---------------+
预期的结果是:
+--------+------------+----------+------------+---------------+
| id | startcount | endcount | increasing | percentChange |
+--------+------------+----------+------------+---------------+
| 123456 | 150 | 300 | 150 | 100.0000 |
| 98765 | 300 | 500 | 200 | 66.6667 |
+--------+------------+----------+------------+---------------+
我一直在查看 group by 或 join 但无法弄清楚这一点,现在已经重做了几天,但我自己陷入了循环。
如果有人能指出我正确的方向或帮助我,那就太好了!