您好， 我是Access的新手，并尝试根据某些时间数据计算滚动的12个月平均值。每个数据点都是该日期的日期和测量值。据我所知，采用滚动平均值的唯一方法是在去年创建所有数据点的生成表。然后创建一个查询以提取最小日期，创建第二个查询以拉出最大日期，创建第三个查询以从最小日期提取测量值，并创建第四个查询以提取最大日期的度量。最后，创建一个fith查询来平均最小/最大测量值。 似乎应该有一种更有效的方法来做到这一点。有什么建议吗？ 谢谢！
解决方案您好， 我是Access的新手，并尝试根据某些时间数据计算滚动的12个月平均值。每个数据点都是该日期的日期和测量值。据我所知，采用滚动平均值的唯一方法是在去年创建所有数据点的生成表。然后创建一个查询以提取最小日期，创建第二个查询以拉出最大日期，创建第三个查询以从最小日期提取测量值，并创建第四个查询以提取最大日期的度量。最后，创建一个fith查询来平均最小/最大测量值。 似乎应该有一种更有效的方法来做到这一点。有什么建议吗？ 谢谢！
你好。 同样的查询可以通过两个子查询来完成。
展开 | 选择 | Wrap | 行号你好。 具有两个子查询的单个查询可以完成相同的操作。 展开 | 选择 | Wrap | 行号
谢谢Fish，非常有帮助。 虽然我没有清楚地描述平均值。我不想取两次测量的平均值，我实际上想要花时间导数。而不是（meas1 + meas2）/ 2，我想要（meas2-meas1）/（date2-date1）。要了解测量结果的增长速度。
好的。 下次请不要犹豫，叫它的名字：D 您需要以什么单位计算时差 - 小时，天，月？
Hello, I''m new to Access and trying to calculate a rolling 12 month average from some time data. Each data point is a date and a measurement taken at that date. As far as I can tell, the only way to take the rolling average is to create a make-table of all the data points within the last year. Then create a query to pull out the minimum date, create a second query to pull out the maximum date, create a thrid query to pull out the measurement from the minimum date, and create a forth query to pull out the measurement for the maximum date. Finally, create a fith query to average the min/max measurements. Seems like there should be a more efficient way to do this. Any suggestions? Thanks!
解决方案 Hello, I''m new to Access and trying to calculate a rolling 12 month average from some time data. Each data point is a date and a measurement taken at that date. As far as I can tell, the only way to take the rolling average is to create a make-table of all the data points within the last year. Then create a query to pull out the minimum date, create a second query to pull out the maximum date, create a thrid query to pull out the measurement from the minimum date, and create a forth query to pull out the measurement for the maximum date. Finally, create a fith query to average the min/max measurements. Seems like there should be a more efficient way to do this. Any suggestions? Thanks!Hello. The same may be done by a single query with two subqueries.
Expand|Select|Wrap|Line Numbers Hello. The same may be done by a single query with two subqueries. Expand|Select|Wrap|Line Numbers Thanks Fish, very helpful. Although I didn''t quite describe the averaging clearly. I don''t want to take the average of the two measurements, I actually want to take the time derivative. Instead of (meas1+meas2)/2, I want (meas2-meas1)/(date2-date1). To find out at what rate the measurement is increasing.Ok. Next time please don''t hesitate to call a thing by its name :D In what units you need to calculate time differential - hours, days, months?
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试图计算滚动12个月的平均值（是新访问的）
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