Attendance System Query

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Hello i am working on attendance system using c# and sql server for the first time i am facing a problem mentioned below

i have some records like this

Student_Name | Attendance | Class

Jones   P    Grade 1
Smith    P    Grade 1
Raven    A    Grade 1
Jash    L    Grade 1

now i want this retrieve this record

Class    |    NoOfStduent | NoOfPresents | NoOfAbsents | NoOfLeaves

Grade 1                4                 2                        1                       1

Is this possible using case ?

Posted 8-Apr-14 10:48am

hussainroyal

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2 solutions

Solution 1

You can use select Class, Attendance, count(*) as No from <table> group by Class, Attendance</table>

Then use this as the inner query on a pivot to transform the data to how you need.

SQL

select Class, P+A+L as Students, P as Present, A as Absent, L as Leaves
from (select Class, Attendance, count(*) as No 
    from <table> 
    group by Class, Attendance
) src Pivot ( sum(No) for Attendance in ( [P], [A], [L] )) pvt
</table>

Posted 8-Apr-14 11:21am

NeverJustHere

Updated 8-Apr-14 22:23pm

v2

Comments

Andrius Leonavicius 8-Apr-14 17:33pm

+5

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Aarti Meswania · Accepted Answer · 2014-04-08T22:35:00

another way...

SQL

SELECT  Class, SUM(Students) NoOfStduent ,SUM(Presents) NoOfPresents ,SUM(Absents) NoOfAbsents ,SUM(Leaves) NoOfLeaves
FROM
(
    SELECT
        Class,
        1 as Students,
        CASE WHEN Attendance = 'P' THEN 1 ELSE 0 END AS Presents,
        CASE WHEN Attendance = 'A' THEN 1 ELSE 0 END AS Absents,
        CASE WHEN Attendance = 'L' THEN 1 ELSE 0 END AS Leaves
    FROM    tableName
) as a
GROUP BY Class

Happy Coding!
:)