Solved Query to show number of student not pass the exam (1 Viewer)

Babycat

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Hi everyone

I have the tables and relationship showed as below.
I want to have query that shows number of student not pass (point <5) first round of exam per class

Can anyone please help me?

The db is attached.
It is prefer to not use more than 1 query.

1646126715265.png
 

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  • Student.zip
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Eugene-LS

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It is prefer to not use more than 1 query.
SQL:
SELECT
    ClassName,
    Sum(IIf([FirstRound_Point]<5,1,0)) AS [Total not pass]
FROM
    (CLASS LEFT JOIN STUDENT ON CLASS.ClassID = STUDENT.ClassID)
    LEFT JOIN RESULT ON STUDENT.StudentID = RESULT.StudentID
GROUP BY CLASS.ClassName
ORDER BY CLASS.ClassName;
 

CJ_London

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create an aggregate query (group by) based on class, student and result

Code:
SELECT CLASS.ClassName, Count(CLASS.ClassID) AS CountOfClassID
FROM CLASS INNER JOIN (STUDENT INNER JOIN RESULT ON STUDENT.StudentID = RESULT.StudentID) ON CLASS.ClassID = STUDENT.ClassID
WHERE (((RESULT.FirstRound_Point)<5))
GROUP BY CLASS.ClassName;
 

Babycat

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Dear buddies

Thanks for your quick helps, but seem the results are not correct. The duplicated values are not exclusive.

As per manual check as below, ClassA has 3 students( A001, A007 and A008) while class B has 2 (A002 and A004)

1646130131434.png


Here is your results, they are incorrect

1646130280791.png


1646130295248.png
 

CJ_London

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Always helps if you provide the outcome expected from the example data since both of us interpreted your requirement the same way

try this

Code:
SELECT CLASS.ClassName, Count(A.ClassID) AS CountOfClassID
FROM (SELECT STUDENT.ClassID, STUDENT.StudentID
FROM STUDENT INNER JOIN RESULT ON STUDENT.StudentID = RESULT.StudentID
WHERE (((RESULT.FirstRound_Point)<5))
GROUP BY STUDENT.ClassID, STUDENT.StudentID)  AS A INNER JOIN CLASS ON A.ClassID = CLASS.ClassID
GROUP BY CLASS.ClassName;
 

Babycat

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Well noted and thank you very much
It works like a charm
 

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