mysql - sql按年计算变化和百分比

Question

我有一个模拟交易账户返回率的数据集。每天都有一个条目显示余额和未平仓权益。我想计算每年、每季度或每月的变化以及 yield 或损失百分比。我可以将其用于每日数据，但由于某种原因，我似乎无法将其用于年度数据。 每日数据代码如下:

SELECT b.`Date`, b.Open_Equity, delta, 
       concat(round(delta_p*100,4),'%') as delta_p 
FROM  (SELECT *,
          (Open_Equity - @pequity) as delta,
          (Open_Equity - @pequity)/@pequity as delta_p,
          (@pequity:= Open_Equity)
       FROM tim_account_history p
          CROSS JOIN
            (SELECT @pequity:= NULL
             FROM tim_account_history
             ORDER by `Date` LIMIT 1) as a
       ORDER BY `Date`) as b
ORDER by `Date` ASC

按年份分组(日期)似乎没有产生预期的差异。我已经尝试了我能想到的一切，但即使您按月或年等分组，它似乎仍然返回每日变化率。我认为我没有正确使用窗口，但我似乎无法弄清楚。如果有人知道一本关于此类查询的好书，我也将不胜感激。 谢谢。 sqlfiddle example

<小时/>

利用 Lolo 贡献的内容，我添加了一些代码，以便数据来自一年的最后一天，而不是第一天。我也只需要 Open_Equity，而不是总和。

我仍然不确定我理解为什么它有效，但它确实给了我我正在寻找的东西。使用另一个 select 语句作为 from 似乎是这里的关键；如果没有洛洛的帮助，我想我不会想出这个办法。谢谢。

SELECT b.`yyyy`, b.Open_Equity, 
    concat('$',round(delta, 2)) as delta,
    concat(round(delta_p*100,4),'%') as delta_p 
FROM   (SELECT *,
          (Open_Equity - @pequity) as delta,
          (Open_Equity - @pequity)/@pequity as delta_p,
          (@pequity:= Open_Equity)
        FROM (SELECT (EXTRACT(YEAR FROM `Date`)) as `yyyy`, 
                (SUBSTRING_INDEX(GROUP_CONCAT(CAST(`Open_Equity` AS CHAR) ORDER BY `Date` DESC), ',', 1 )) AS `Open_Equity`
            FROM tim_account_history GROUP BY `yyyy` ORDER BY `yyyy` DESC) p
            CROSS JOIN
            (SELECT @pequity:= NULL) as a
       ORDER BY `yyyy` ) as b
ORDER by `yyyy` ASC

Answer 1

试试这个:

SELECT b.`Date`, b.Open_Equity, delta, 
       concat(round(delta_p*100,4),'%') as delta_p 
FROM  (SELECT *,
          (Open_Equity - @pequity) as delta,
          (Open_Equity - @pequity)/@pequity as delta_p,
          (@pequity:= Open_Equity)
       FROM (SELECT YEAR(`Date`) `Date`, SUM(Open_Equity) Open_Equity FROM tim_account_history GROUP BY YEAR(`Date`)) p
          CROSS JOIN
            (SELECT @pequity:= NULL) as a
       ORDER BY `Date` ) as b
ORDER by `Date` ASC