Consider the relation EMPLOYEE(Eid, Name, Did, Salary, Age, Phone). Create indexes to support the following three important queries. Describing these indexes (tree, hash, cluster, etc.) and explaining your reasons are sufficient. You do not need to write the SQL statements. SELECT E.Phone SELECT E.Name SELECT E.Did, AVG (E.Salary) FROM EMPLOYEE E FROM EMPLOYEE E FROM EMPLOYEE E WHERE E.Eid = ... some ID WHERE E.Age < 45 GROUP BY E.Did

Consider the relation EMPLOYEE(Eid, Name, Did, Salary, Age, Phone). Create indexes to support the following three important queries. Describing these indexes (tree, hash, cluster, etc.) and explaining your reasons are sufficient. You do not need to write the SQL statements. SELECT E.Phone SELECT E.Name SELECT E.Did, AVG (E.Salary) FROM EMPLOYEE E FROM EMPLOYEE E FROM EMPLOYEE E WHERE E.Eid = ... some ID WHERE E.Age < 45 GROUP BY E.Did

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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Concept explainers

Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.

Question

Consider the relation EMPLOYEE(Eid, Name, Did, Salary, Age, Phone). Create indexes to
support the following three important queries. Describing these indexes (tree, hash, cluster, etc.) and
explaining your reasons are sufficient. You do not need to write the SQL statements.
SELECT E.Phone
SELECT E.Name
SELECT
E.Did, AVG (E.Salary)
FROM EMPLOYEE E
FROM EMPLOYEE E
FROM
EMPLOYEE E
WHERE E.Eid = . some ID
WHERE E.Age < 45
GROUP BY E.Did

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