Question

我有一个Access表，我可以在其中计算列的出现次数，但是除了计数之外，我还需要这些出现次数的百分比

我的表有两列。月，主题。我可以检索计数，例如表中的主题A出现了10次，主题B出现了15次，依此类推。

尝试了这两个代码，但给出了语法错误代码1

SELECT Subjects, 
COUNT(Subjects.Subject) AS CountOfSubject,
(SELECT COUNT(Subjects.Subject))/(SELECT SUM(Subjects.CountofSubject)))    AS PercentofSubject
FROM Subjects 
GROUP BY Subject;

代码2

SELECT Subjects, 
COUNT(Subjects.Subject) AS CountOfSubject,
(SELECT AVG(Subjects.CountofSubject)) AS PercentofSubject
FROM Subjects
GROUP BY Subject;

但是，我需要附加一栏来显示这些主题发生的百分比值。非常感谢

Answer 1

我在您的代码中看到的最大问题是，您没有通过使用完整的子查询来正确地规范计数。试试这个版本：

SELECT
    Subject,
    COUNT(*) AS CountOfSubject,
    100.0 * COUNT(*) / (SELECT COUNT(*) FROM Subjects) AS PercentOfSubject
FROM Subjects 
GROUP BY Subject;

MS-Access中计数值的百分比

1 个答案: