Q75

Consider the following relational schema: $\text{Student} (\underline{\text{school-id}, \text{sch-roll-no}}, \text{sname}, \text{saddress})$ $\text{School} (\underline{\text{school-id}}, \text{sch-name}, \text{sch-address}, \text{sch-phone})$ $\text{Enrolment}(\underline{\text{school-id}, \text{sch-roll-no}}, \text{erollno}, \text{examname})$ $\text{ExamResult}(\underline{\text{erollno}, \text{examname}}, \text{marks})$ Consider the following tuple relational calculus query. $\left\{t \mid \exists E \in \text{Enrolment }\;\; t = E.\text{school-id} \wedge \left | \{x \mid x \in \text{Enrolment} \wedge x.\text{school-id} = t \wedge (\exists B \in \text{ExamResult} \;\;B.\text{erollno} = x.\text{erollno} \wedge B.\text{examname} = x.\text{examname} \wedge B.\text{marks} > 35)\}\right | \div \left | \{x \mid x \in \text{Enrolment} \wedge x.\text{school-id} = t\}\right | * 100 > 35\right\}$ If a student needs to score more than 35 marks to pass an exam, what does the query return?