query to calculate defaulters

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hello all,
pls help me in forming the query to calculate the number of defaulter students for a given month. A student is a defaulter if his attendance is less than 75%.
The table structure is as follows:
1>int record_no (primary key)
2>int year
3>varchar sem
4>varchar stuid (student id)
5>int subid (subject id)
6>varchar type (theory/practical)
7>int present (no of days present)
8>int absent (no of days absent)
9>int working (total no of days)
10>varchar month

i have written this query but the logic is wrong:

select stuid,present,absent,working,type from attendance1 where year = '" + ddlyear.SelectedValue + "' and sem = '" + ddlsem.SelectedValue + "' and subid = '" + ddlsubid.SelectedValue + "' and month = '" + ddlmonth.SelectedValue + "' and present<absent

Posted 10-Jun-11 1:04am

debo_india

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3 solutions

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Prerak Patel · Answer 1 · 2011-06-10T01:20:00

Solution 1

Use present < 0.75 * (present+absent) for 75% attendance.
present < absent would be 50% criteria.

Posted 10-Jun-11 1:20am

Prerak Patel

Updated 10-Jun-11 1:21am

v2

Wayne Gaylard · Answer 2 · 2011-06-10T01:35:00

Try this one

SQL

SELECT
    `recordno`, `year`, `sem`, `stuid`,`subid`, `type`, ((100 / `working`) * `present` ) AS Percentage
FROM
    Students
WHERE
    ((100 / `working`) * `present` ) < 75
AND
    `month` = @SelectedMonth
AND
`subid` = @SelectedSubjectID;

This assumes that working is the total working days in the month, and that by inference, you calculate the percentage 100 divided by the total days, times the number of days attended (present).

Hope this helps

N!dh!sh · Answer 3 · 2011-06-10T02:23:00

Solution 3

try this,

select stuid,present,absent,working,[type] from attendance1 where ((present *100)/working )<75

............
@Nidhish

Posted 10-Jun-11 2:23am

N!dh!sh