堆栈内存溢出
  繁体   English   中英

MySQL根据两列查找与前一天记录的差异

[英]MySQL Find difference in records against previous day based on two columns

 原文  2018-06-21 09:13:08  6   2    mysql/ sql/ join/ group-by

问题描述

在您阅读之前，请注意，我已经创建了一个查询来实现以下目的，但我想再次检查我是否做错了什么，或者是否有更有效的方法。

我在MySQL表中有一组记录，如下所示（按运行代码段查看该表） 

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"/> <title></title> <meta name="generator" content="LibreOffice 4.4.5.2 (Windows)"/> <meta name="created" content="2018-06-21T09:33:19.600000000"/> <meta name="changed" content="2018-06-21T09:42:20.756000000"/> <style type="text/css"> body,div,table,thead,tbody,tfoot,tr,th,td,p { font-family:"Calibri"; font-size:x-small } </style> </head> <body> <table cellspacing="0" border="0"> <colgroup width="85"></colgroup> <colgroup width="84"></colgroup> <colgroup width="110"></colgroup> <colgroup width="127"></colgroup> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="left"><font color="#000000">Date</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">PortfolioId</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">ISIN</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">AssetOwnsership</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43269" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">18/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="1234" sdnum="2057;"><font color="#000000">1234</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B069DV22</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="1" sdnum="2057;"><font color="#000000">1</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43270" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">19/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B069DV22</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="1.18" sdnum="2057;"><font color="#000000">1.18</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43270" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">19/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B6774699</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.1298" sdnum="2057;"><font color="#000000">0.1298</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43270" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">19/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000"><br></font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0" sdnum="2057;"><font color="#000000">0</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43270" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">19/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="82294" sdnum="2057;"><font color="#000000">82294</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000"><br></font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0" sdnum="2057;"><font color="#000000">0</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43270" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">19/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="82294" sdnum="2057;"><font color="#000000">82294</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000"><br></font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0" sdnum="2057;"><font color="#000000">0</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43270" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">19/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="82294" sdnum="2057;"><font color="#000000">82294</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B6774699</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.1378" sdnum="2057;"><font color="#000000">0.1378</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B069DV22</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="1.25" sdnum="2057;"><font color="#000000">1.25</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B6774699</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.1175" sdnum="2057;"><font color="#000000">0.1175</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B6774691</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.1" sdnum="2057;"><font color="#000000">0.1</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="21" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="1234" sdnum="2057;"><font color="#000000">1234</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font color="#000000">GB00B6774699</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.5" sdnum="2057;"><font color="#000000">0.5</font></td> </tr> </table> <!-- ************************************************************************** --> </body> </html>

我想做的是找到资产昨天和昨天之间的区别，以使AssetOwnsership列根据两个列（ISIN和Portfolio ID）的匹配来显示当前头寸的增加或减少，并输出任何新记录/头寸今天。

根据以上数据集，输出应为：（按运行代码段查看表） 

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"/> <title></title> <meta name="generator" content="LibreOffice 4.4.5.2 (Windows)"/> <meta name="created" content="2018-06-21T10:02:42.397000000"/> <meta name="changed" content="2018-06-21T10:03:10.865000000"/> <style type="text/css"> body,div,table,thead,tbody,tfoot,tr,th,td,p { font-family:"Liberation Sans"; font-size:x-small } </style> </head> <body> <table cellspacing="0" border="0"> <colgroup span="4" width="85"></colgroup> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="32" align="left"><font face="Liberation Serif" color="#000000">Date</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">PortfolioId</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">ISIN</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">AssetOwnsership</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="32" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font face="Liberation Serif" color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font face="Liberation Serif" color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">GB00B069DV22</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.0700000000000001" sdnum="2057;"><font face="Liberation Serif" color="#000000">0.07</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="32" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font face="Liberation Serif" color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font face="Liberation Serif" color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">GB00B6774699</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="-0.0123" sdnum="2057;"><font face="Liberation Serif" color="#000000">-0.0123</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="32" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font face="Liberation Serif" color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="3521" sdnum="2057;"><font face="Liberation Serif" color="#000000">3521</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">GB00B6774691</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.1" sdnum="2057;"><font face="Liberation Serif" color="#000000">0.1</font></td> </tr> <tr> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" height="32" align="right" sdval="43271" sdnum="2057;0;DD/MM/YYYY"><font face="Liberation Serif" color="#000000">20/06/2018</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="1234" sdnum="2057;"><font face="Liberation Serif" color="#000000">1234</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="left"><font face="Liberation Serif" color="#000000">GB00B6774699</font></td> <td style="border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000" align="right" sdval="0.5" sdnum="2057;"><font face="Liberation Serif" color="#000000">0.5</font></td> </tr> </table> <!-- ************************************************************************** --> </body> </html>

我创建了下面的SQL查询，该查询为我提供了以下数据:(假设今天是20/06/2018，可以对数据进行运行） 

SELECT *, (case WHEN SUM(b.assetownsership-a.assetownsership)=0 then b.assetownsership
else SUM(b.assetownsership-a.assetownsership)
end) Difference, (case WHEN SUM(b.assetownsership-a.assetownsership)<0 then "S"
else "B"
end) BuySell
FROM performance.Assetallocation a
JOIN performance.Assetallocation b on b.isin = a.isin and b.portfolioID=a.portfolioID 
where b.date>=DATE_FORMAT(CURDATE(), '%d/%m/%Y')-1
group by a.portfolioID, a.isin

我的问题是：

  • 有没有更好的方法来实现这一目标？
  • 即使看起来可以提供正确的输出，我在查询中做错了什么吗？

2 个解决方案

解决方案1
 0  2018-06-21 09:38:59

我认为您的查询需要进行明显的更改，因为您需要根据protfolioID和ISIN找到今天和昨天之间的差异，它应该像 

SELECT 
    b.date, 
    (CASE WHEN (b.assetownsership-a.assetownsership)<=0 THEN b.assetownsership
        ELSE (b.assetownsership-a.assetownsership) END) Difference, 
    (CASE WHEN (b.assetownsership-a.assetownsership)<0 THEN "S" ELSE "B" END) BuySell
FROM performance.Assetallocation a
JOIN performance.Assetallocation b ON b.isin = a.isin AND b.portfolioID=a.portfolioID 
WHERE b.date = DATE_FORMAT(CURDATE(), '%d/%m/%Y') 
        AND a.date = DATE_FORMAT(CURDATE(), '%d/%m/%Y')-1

解决方案2
 0 已采纳  2018-06-21 10:15:26

我认为这是查询的更好形式： 

select a.portfolioID, a.isin,
       sum(case when a.date = curdate()
                then a.assetownsership
                when a.date = curdate() - interval 1 day 
                then - a.assetownsership
           end) as difference,
       (case when sum(case when a.date = curdate()
                           then a.assetownsership
                           when a.date = curdate() - interval 1 day 
                           then - a.assetownsership
                      end) < 0
              then 'S' else 'B'
         end) as BuySell
from performance.Assetallocation a
where a.date >= curdate() - interval 1 day
group by a.portfolioID, a.isin;

笔记：

  • 这使用条件聚合，因此不需要join 。
  • 假设date确实是一个日期。 如果它具有时间成分，请使用date()函数或类似的逻辑。
  • select唯一未聚合的表达式应该是group by表达式。 因此，没有select * 。
  • 在进行日期/时间比较时，请使用本机字符串操作。 除非确实需要，否则不要将日期/时间转换为字符串。

暂无
暂无

声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

相关问题 SQL根据两列查找记录 如何找到同一天同一列的两个日期之间的差异？ 根据MySQL中的两列查找MIN值 如何根据&#39;title&#39;和&#39;description&#39;列在MySQL表中找到“相似”记录？ MySQL在两列中的区别 如何比较两列以在MySQL中找到不匹配的记录 mysql 根据多行条件查找记录 如何找到Mysql中两列之间的最小差异？ MySQL找到两个日期不同列之间的差异 MYSQL - 查找每日3个最佳评分记录
相关标签
 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM