What does a given primary key mean within the big-picture context of a problem?What are primary, foreign, external, surrogate, and substitute keys?Be prepared to write SELECT, INSERT, UPDATE, or DELETE queries by hand.including SELECT statements with JOIN, WHERE, and/or ORDER BYWhat are the Sigma and Pi operators in relational algebra? Can you use them to express the equivalent of a given SQL query?

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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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What does a given primary key mean within the big-picture context of a problem?
What are primary, foreign, external, surrogate, and substitute keys?
Be prepared to write SELECT, INSERT, UPDATE, or DELETE queries by hand.
- including SELECT statements with JOIN, WHERE, and/or ORDER BY
What are the Sigma and Pi operators in relational algebra? Can you use them to express the equivalent of a given SQL query?

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