Mysql 获取最后记录的百分比差异

我有下一张桌子：

+----+-----------+------------+-----------+
| ID | market_id | last_value | timestamp |
+----+-----------+------------+-----------+
| 1  |    1      |     10     |   1001    |
| 2  |    1      |     15     |   1002    |
| 3  |    1      |     25     |   1003    |
| 4  |    1      |     30     |   1004    |
| 5  |    1      |     05     |   1005    |
+----+-----------+------------+-----------+

我的想法与此类似：

SELECT id, market_id, last_value, timestamp from data_markets
where from_unixtime(timestamp, '%d-%m-%Y %H:%m:%s') >= DATE_FORMAT(NOW(),'%d-%m-%Y 00:00:00') and market_id = 1

有了这个，我得到了今天的所有行，但我知道使用join可以得到：

+---+----------------------+--------------------+----------+
| market_id |    change    |    total_change    |  is_down |
+-----------+--------------+--------------------+----------+
|     1     |     83.3%    |      -50.00%       |   true   |
+-----------+--------------+--------------------+----------+

说明：

• 更改：此值与最后一行的差值

• 总更改：该值是“24小时”中所有行的差异

• 是向下的：它可能知道该值相对于总更改是增加还是减少

编辑：

---

我编辑了这个示例，总的来说，我喜欢所有行的差异，但这不可能是第一行的差异。

我认为这是一个查询，它提供了您想要的大部分内容

SELECT
    dm.id,
    dm.market_id,
    dm.last_value,
    (@prev_value := (SELECT last_value FROM data_markets WHERE (id < dm.id AND market_id = dm.market_id) ORDER BY id DESC LIMIT 1)) AS prev_value,
    ROUND((@24hr_value := (SELECT AVG(last_value) FROM data_markets WHERE (timestamp >= (dm.timestamp - 86400) AND timestamp < dm.timestamp AND market_id = dm.market_id))),1) AS 24hr_value,
    ROUND(IF(@prev_value,(((dm.last_value - @prev_value) / @prev_value) * 100),0),1) AS percent_change,
    ROUND((@24hr_change := IF(@24hr_value,(((dm.last_value - @24hr_value) / @24hr_value) * 100),0)),1) AS 24hr_change,
    IF(@24hr_change < 0, 'down', IF(@24hr_change > 0, 'up', '-')) AS direction
FROM
    data_markets dm,
    (SELECT
        @prev_value:=0,
        @24hr_value:=0,
        @24hr_change:=0
    ) r
WHERE
    dm.market_id = 1
ORDER BY
    dm.id ASC

以及最终结果集：

===============================================================================
|id | market_id | last_value | prev | 24hr | change | 24hr_change | direction |
===============================================================================
| 1 | 1         | 10         | NULL | NULL | 0.0    | 0.0         | -         |
| 2 | 1         | 15         | 10   | NULL | 50.0   | 0.0         | -         |
| 3 | 1         | 25         | 15   | NULL | 66.7   |  0.0        | -         |
| 4 | 1         | 30         | 25   | 25.0 | 20.0   | 20.0        | up        |
| 5 | 1         | 5          | 30   | 27.5 | -83.3  | -83.6       | down      |
===============================================================================

---

你所说的过去24小时的总变化是什么意思？如果在过去的24小时内同时有一个大得多的值和一个小得多的值呢？这将创建两个完全不同的总更改值。还是你指的是24小时平均值？@Jay:我想他想把一行和其他行进行比较，然后打印出变化百分比（%）的变化。如果最后一个值是10，倒数第二个值是20，那么变化是100%（我认为）。总变化是1整天的这个百分比。

===============================================================================
|id | market_id | last_value | prev | 24hr | change | 24hr_change | direction |
===============================================================================
| 1 | 1         | 10         | NULL | NULL | 0.0    | 0.0         | -         |
| 2 | 1         | 15         | 10   | NULL | 50.0   | 0.0         | -         |
| 3 | 1         | 25         | 15   | NULL | 66.7   |  0.0        | -         |
| 4 | 1         | 30         | 25   | 25.0 | 20.0   | 20.0        | up        |
| 5 | 1         | 5          | 30   | 27.5 | -83.3  | -83.6       | down      |
===============================================================================