我有两个表 tblStudent 和 tblTranscript。我想计算 GPA > 3.5 的学生百分比。我创建了两个查询,分别给出 GPA 学生总数和 GPA > 3.5 学生总数。
我不知道如何将这两个表相除并将它们乘以 100 以获得 GPA > 3.5 的学生百分比。
我的查询是:
平均绩点 > 3.5
SELECT COUNT (GPA) FROM (
SELECT avg(Grade) as GPA, studentID from tblTranscript
GROUP BY studentID HAVING avg(Grade) > 3.5)
TotalCountWithGPA
SELECT COUNT (GPA) FROM (
SELECT avg(Grade) as GPA, StudentID FROM tblTranscript
GROUP BY StudentID)
解决方案:
SELECT
(COUNT (GPA)
/
(SELECT COUNT(GPA) FROM (SELECT avg(Grade) as GPA, StudentID FROM tblTranscript GROUP BY StudentID)) * 100) as PercentageOfStudents
FROM (SELECT avg(Grade) as GPA, studentID from tblTranscript GROUP BY studentID HAVING avg(Grade) > 3.5)
最佳答案
试试这个,
SELECT
(COUNT (studentID)/(SELECT COUNT(studentID) FROM tblTranscript)) as percentageOfStudents
FROM (
SELECT avg(Grade) as GPA, studentID from tblTranscript
GROUP BY studentID HAVING avg(Grade) > 3.5)
希望它能像你期望的那样工作
关于mysql - 如何从两个表中计算 GPA > 3.5 的百分比?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40992226/