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Example of GROUP BY and COLLECT Operator
Example: Using GROUP BY and COLLECT to obtain C_ER2
SELECT CourseId,
CAST (
COLLECT (ROW (StudentId, Mark))
AS ROW (StudentId SID, Mark INTEGER) MULTISET)
AS ExamResult
FROM EXAM_MARK
GROUP BY CourseId
Explanation
Using FIRST and LAST FIRST and LAST return the first and last (minimum and maximum) index numbers in a collection. When the collection is empty, the FIRST and LAST return NULL
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