blocks|key|144557|text|SELECT+SUM(volume)/10+FROM+table_name
Where+date+Between+Cast('7/18/13+12:01:01'+As+DateTime)+And+Cast('7/08/13+12:01:01'+as+DateTime)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|144558|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>SELECT SUM(volume)/10 FROM table_name
Where date Between Cast('7/18/13 12:01:01' As DateTime) And Cast('7/08/13 12:01:01' as DateTime)
</code></pre>

blocks|key|1224284|text|SELECT+AVG(volume)+FROM+mytable+WHERE+date+>=+(CURDATE()+-+INTERVAL+10+DAY)+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1224285|编辑：|unstyled|offset|length|style|BOLD|1224286|过去10天的小组，以及他们的平均水平。|1224287|SELECT+AVG(volume)+FROM+mytable+GROUP+BY+date+ORDER+BY+date+DESC+LIMIT+10+|1224288|entityMap^0|0|0|3|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@$G|S|H|T|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$B|C]]|$1|O|3|-4|5|F|7|W|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>SELECT AVG(volume) FROM mytable WHERE date &gt;= (CURDATE() - INTERVAL 10 DAY) 
</code></pre>

EDIT:

Last 10 day groups, and their averages.

<pre><code>SELECT AVG(volume) FROM mytable GROUP BY date ORDER BY date DESC LIMIT 10 
</code></pre>

blocks|key|2542298|text|http://sqlfiddle.com/#!6/c8dbb/4|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2542299|CREATE+TABLE+Stocks
++++([StockId]+int,+[Date]+DateTime,+[Volume]+int)
;

INSERT+INTO+Stocks
++++([StockId],+[Date],+[Volume])
VALUES
++++(1,+GetDate(),+1000),
++++(1,+GetDate()%2B1,+2000),
++++(1,+GetDate()%2B2,+4000),
++++(2,+GetDate(),+1000),
++++(2,+GetDate()%2B1,+1000),
++++(2,+GetDate()%2B2,+500)
;

Select+StockId,+AVG(Volume)+[AverageVolume]
FROM+Stocks
WHERE+[Date]+>=+DATEADD(dd,+0,+DATEDIFF(dd,+0,+GetDate()))+-+10
Group+by+StockId
Order+by+StockId|code-block|syntax|javascript|2542300|entityMap|0|LINK|mutability|MUTABLE|url^0|0|W|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|4]]]]

<a href="http://sqlfiddle.com/#!6/c8dbb/4" rel="nofollow">http://sqlfiddle.com/#!6/c8dbb/4</a>

<pre><code>CREATE TABLE Stocks
 ([StockId] int, [Date] DateTime, [Volume] int)
;

INSERT INTO Stocks
 ([StockId], [Date], [Volume])
VALUES
 (1, GetDate(), 1000),
 (1, GetDate()+1, 2000),
 (1, GetDate()+2, 4000),
 (2, GetDate(), 1000),
 (2, GetDate()+1, 1000),
 (2, GetDate()+2, 500)
;

Select StockId, AVG(Volume) [AverageVolume]
FROM Stocks
WHERE [Date] &gt;= DATEADD(dd, 0, DATEDIFF(dd, 0, GetDate())) - 10
Group by StockId
Order by StockId
</code></pre>

blocks|key|1224310|text|我是以Dodecapus的答案为基础的，基于你对其他答案的评论。我只是在回答中包含了查询，但请查看sqlfiddle中的数据工作示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1224311|http://sqlfiddle.com/#!6/91599/2|offset|length|1224312|SELECT+
++++StockId
+++,AVG(Volume)+[AverageVolume]
FROM+Stocks
WHERE+[Date]+IN+
(
++SELECT+DISTINCT+TOP+10+[Date]+FROM+Stocks+ORDER+BY+[Date]+DESC
)
GROUP+BY+StockId
ORDER+BY+StockId|code-block|syntax|javascript|1224313|只有在每个交易日成交量至少有一只股票的记录下，这才能奏效。|1224314|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|W|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|H|7|Y|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|Z|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|C]]]]

I'm basing this off of Dodecapus answer and based off of comments you've given to other answers. I'm just including query in answer but check out sqlfiddle for working example with data.

<a href="http://sqlfiddle.com/#!6/91599/2" rel="nofollow">http://sqlfiddle.com/#!6/91599/2</a>

<pre><code>SELECT 
 StockId
 ,AVG(Volume) [AverageVolume]
FROM Stocks
WHERE [Date] IN 
(
 SELECT DISTINCT TOP 10 [Date] FROM Stocks ORDER BY [Date] DESC
)
GROUP BY StockId
ORDER BY StockId
</code></pre>

This will only work if there is a record of at least one stock with volume per trading day.

I have a database that stores data from the stock market.

There is a table with 3 columns: stockId, date, and volume

New data will be inserted into the table every trading day.

How can I get a result like 'Average volume for each stock over the last 10 trading days'?

Get average number during period

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个存储股市数据的数据库。有一个包含3列的表: stockId、日期和卷每个交易日都会在表格中插入新的数据。我怎样才能得到“过去10个交易日内每只股票的平均成交量”这样的结果？

问获得期间的平均数目
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