MySQL根据两列查找与前一天记录的差异

时间：2018-06-21 09:13:09

标签： mysql sql join group-by

在您阅读之前，请注意，我创建了一个查询来实现以下目的，但只是想仔细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)"/>
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<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>
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</body>

</html>

我想做的是找到Assetswnwnsership列在今天和昨天之间的差异，以基于两列（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/今天的位置。

基于上述数据集，输出应为：（按运行代码段查看表）

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<html>
<head>
	
	<meta http-equiv="content-type" content="text/html; charset=windows-1252"/>
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</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：

  • 是否有更好的方法来实现这一目标？
  • 即使看起来提供了正确的输出，我在查询中做错了什么吗？

2 个答案:

答案 0 :(得分：0)

我认为您的查询需要进行重大更改，因为您需要根据protfolioID和ISIN查找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

答案 1 :(得分：0)

我认为这是查询的一种更好形式：

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;

注意：

  • 这使用条件聚合，因此不需要join。
  • 这假设date实际上是一个日期。如果它具有时间成分，请使用date()函数或类似的逻辑。
  • select中唯一未聚合的表达式应该是group by中的表达式。因此，没有select *。
  • 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。
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