Give conditions under which the following expressions are equivalent: where agg denotes any aggregation operation. How can
Question:
Give conditions under which the following expressions are equivalent:
where agg denotes any aggregation operation. How can the above conditions be relaxed if agg is one of min or max?
Transcribed Image Text:
A,BY agg(C) (E₁ E₂) and (Yagg(c)(E₁)) □ E₂
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An aggregate function can be used in a WHERE clause only if that clause ...View the full answer
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Related Book For
Database System Concepts
ISBN: 9780078022159
7th Edition
Authors: Abraham Silberschatz, Henry F. Korth, S. Sudarshan
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