[英]SQL Percentage Count Query By Date
我能够使用以下方法计算Microsoft Access 2007 SQL查询中特定日期的百分比计数:
SELECT Date, Val, (Count(Val) / (SELECT Count(*) From Table HAVING Date=#7/31/2012#) as PercentVal
FROM Table
GROUP BY Date, Val
HAVING Date=#7/31/2012#
但是,我想使用count total在每个日期进行相同的计算。 例如,查询:
SELECT Date, Val, Count(*) AS CountVal
FROM Table
GROUP BY Date, Val
查找每个时期的计数。 我想添加一个带有百分比计数的附加列。 但是,我似乎无法弄清楚如何在不使用上述文本块并为每个单独的时期设置查询的情况下,计算每个时期的计数百分比。
您可以像这样子查询它:
SELECT A.ADate, A.Val, COUNT(A.Val) / B.DateCount
FROM Table1 AS A
INNER JOIN (
SELECT C.ADate, COUNT(*) AS DateCount
FROM Table1 C
GROUP BY C.ADate
) AS B ON A.ADate = B.ADate
GROUP BY A.ADate, A.Val, B.DateCount
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