Question

如何按年龄平均时间后创建子查询？我想把这个年龄组成一个'20 -29'组，并且该年龄组的总体平均值

SELECT [PAT Data].Gender, [PAT Data].Age, Avg([PAT Data].CourseTime) AS AvgOfCourseTime
FROM [PAT Data]
GROUP BY [PAT Data].Gender, [PAT Data].Age
HAVING ((([PAT Data].Gender)="F") AND (([PAT Data].Age)>="20" And ([PAT 
Data].Age)<="29"))


UNION

SELECT [PAT Data].Gender, [PAT Data].Age, Avg([PAT Data].CourseTime) AS 
AvgOfCourseTime
FROM [PAT Data]
GROUP BY [PAT Data].Gender, [PAT Data].Age
HAVING ((([PAT Data].Gender)="F") AND (([PAT Data].Age)>="30" And ([PAT 
Data].Age)<="39"))

UNION

SELECT [PAT Data].Gender, [PAT Data].Age, Avg([PAT Data].CourseTime) AS 
AvgOfCourseTime
FROM [PAT Data]
GROUP BY [PAT Data].Gender, [PAT Data].Age
HAVING ((([PAT Data].Gender)="F") AND (([PAT Data].Age)>="40" And ([PAT 
Data].Age)<="49"));

This is how it looks when run currently

Answer 1

您可以使用switch()：

SELECT SWITCH(Age >= 20 And Age <= 29, "20-29",
              Age >= 30 And Age <= 39, "30-49",
              Age >= 40 And Age <= 49, "40-59",
              "Other") as agegrp,
       Gender,  Avg([PAT Data].CourseTime) AS AvgOfCourseTime
FROM [PAT Data]
WHERE [PAT Data].Gender) = "F"
GROUP BY [PAT Data].Gender,
         SWITCH(Age >= 20 And Age <= 29, "20-29",
                Age >= 30 And Age <= 39, "30-49",
                Age >= 40 And Age <= 49, "40-59",
                "Other") ;

Answer 2

您可以使用整数除法＆＃34; \＆＃34;和简单的连接：

SELECT 
    10 * (Age \ 10) & "-" & 10 * (Age \ 10) + 9 As AgeGroup,
    Gender,  
    Avg(CourseTime) As AverageCourseTime
FROM 
    [PAT Data]
WHERE 
    Gender = "F"
GROUP BY 
    10 * (Age \ 10) & "-" & 10 * (Age \ 10) + 9

如果您希望达到最低年龄：

WHERE 
    Gender = "F",
    Val(Age) >= 20

并将Age存储为整数，而不是文本。如果是数字，那么：

WHERE 
    Gender = "F",
    Age >= 20

使用AVG时在MS Access中创建子查询？

3 个答案: