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Information about a collection of students is given by the relation studinfo(studId, name, sex). The relation enroll(studId, courseId) gives which student has enrolled for (or taken) that course(s). Assume that every course is taken by at least one male and at least one female student. What does the following relational algebra expression represent?
  • a)
    Courses in which all the female students are enrolled.
  • b)
    Courses in which a proper subset of female students are enrolled.
  • c)
    Courses in which only male students are enrolled.
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Information about a collection of students is given by the relationstu...
The expression given in question does following steps in sequence.
a) Select studids of all female students and selects all courseids of all courses.
b) Then the query does a Cartesian Product of the above select two columns from different tables.
c) Finally it subtracts enroll table from the result of above step (b). This will remove all the (studid, courseid) pairs which are present in enroll table. If all female students have registered in a courses, then this course will not be there in the subtracted result.
So the complete expression returns courses in which a proper subset of female students are enrolled.
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Information about a collection of students is given by the relationstudinfo(studId, name, sex). The relationenroll(studId, courseId)gives which student has enrolled for (or taken) that course(s). Assume that every course is taken by at least one male and at least one female student. What does the following relational algebra expression represent?a)Courses in which all the female students are enrolled.b)Courses in which a proper subset of female students are enrolled.c)Courses in which only male students are enrolled.d)None of the aboveCorrect answer is option 'B'. Can you explain this answer?
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Information about a collection of students is given by the relationstudinfo(studId, name, sex). The relationenroll(studId, courseId)gives which student has enrolled for (or taken) that course(s). Assume that every course is taken by at least one male and at least one female student. What does the following relational algebra expression represent?a)Courses in which all the female students are enrolled.b)Courses in which a proper subset of female students are enrolled.c)Courses in which only male students are enrolled.d)None of the aboveCorrect answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Information about a collection of students is given by the relationstudinfo(studId, name, sex). The relationenroll(studId, courseId)gives which student has enrolled for (or taken) that course(s). Assume that every course is taken by at least one male and at least one female student. What does the following relational algebra expression represent?a)Courses in which all the female students are enrolled.b)Courses in which a proper subset of female students are enrolled.c)Courses in which only male students are enrolled.d)None of the aboveCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Information about a collection of students is given by the relationstudinfo(studId, name, sex). The relationenroll(studId, courseId)gives which student has enrolled for (or taken) that course(s). Assume that every course is taken by at least one male and at least one female student. What does the following relational algebra expression represent?a)Courses in which all the female students are enrolled.b)Courses in which a proper subset of female students are enrolled.c)Courses in which only male students are enrolled.d)None of the aboveCorrect answer is option 'B'. Can you explain this answer?.
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