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Grouping and Ungrouping in SQL
Example specifying EXAM_MARK in place of COURSE in the main FROM clause.
Example: Obtaining C_ER2 from EXAM_MARK
SELECT CourseId,
CAST (
TABLE (SELECT DISTINCT StudentId, Mark
FROM EXAM_MARK AS EM2
WHERE EM1.CourseId = EM2.CourseId)
AS ROW ( StudentId SID, Mark INTEGER ) MULTISET )
AS ExamResult
FROM EXAM_MARK AS EM
Figure shows the result, named C_ER2 for convenience. It differs from the C_ER of Figure 5.3 only in the absence of a row for course C4, whose exam nobody sat.
Figure: Intermediate result C_ER2
Question: Consider the following relations (primary keys are underlined): AUTHOR (ANo, aname, address, speciality) PUBLISHER (PNo, pname, Location) BOOK (BNo, Title, ISBN,
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