Give conditions under which the following expressions are equivalent:A,Bγagg(C)(E1 ⋈ E2) and (Aγagg(C)(E1)) ⋈ E2where agg denotes any aggregation operation. How can the above conditionsbe relaxed if agg is one of min or max?

Answered: Give conditions under which the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Give conditions under which the following expressions are equivalent:
_A,Bγ_agg(C)(E₁ ⋈ E₂) and (_Aγ_agg(C)(E₁)) ⋈ E₂
where agg denotes any aggregation operation. How can the above conditions
be relaxed if agg is one of min or max?

Expert Solution

Step 1

In the database, relations generated (or created) by two equivalent expressions contain the same (or identical) set of attributes and tuples but the order of the attributes can be different and also produce the same recordset.

An aggregate function in a database enables the user to perform arithmetic operations on a given set of values and returns only one scalar value.

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