Find student whose attendence is less than 75%

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Oracle
Find student whose attendence is less than 75% in subject AC? select k.studentID, k.PercentageAttd from ( select a.STUDENTNO as studentID, (select count(PRESENCE_K)*100 from attendence b1 where b1.PRESENCE_K='P' and STUDENTNO=a.STUDENTNO and subject_k = 'AC')/ (select count(PRESENCE_K) from attendence b2 where STUDENTNO=a.STUDENTNO and subject_k = 'AC') as PercentageAttd from attendence a) k where k.PercentageAttd<=75;

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select a.studentno,
(sum(decode(a.presence_k,’P’,1,0))/count(a.presence_k))*100 as PercentAttd
from attendence a
where a.subject_k = ‘AC’
group by a.studentno
having (sum(decode(a.presence_k,’P’,1,0))/count(a.presence_k))*100 < 75

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