Question
Suppose that a two-pass external merge-sort is used to evaluate the GROUP BY and Count operations in the following query. Assuming that there is enough
Suppose that a two-pass external merge-sort is used to evaluate the GROUP BY and Count operations in the following query. Assuming that there is enough memory to do so, explain how this algorithm works.
Select department, Count(*)
From Students
GROUP BY department
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Machine Learning And Knowledge Discovery In Databases Applied Data Science Track European Conference Ecml Pkdd 2021 Bilbao Spain September 13 17 2021 Proceedings Part 4 Lnai 12978
Authors: Yuxiao Dong ,Nicolas Kourtellis ,Barbara Hammer ,Jose A. Lozano
1st Edition
3030865134, 978-3030865139
