Which of the following statements would create a UNION between all of the countries we have customers, employees, or invoices in? SELECT countryFROM invoiceUNIONSELECT countryFROM customerUNIONSELECT countryFROM employee;SELECT billing_countryFROM invoiceSELECT countryFROM customerSELECT countryFROM employeeUNION;SELECT billing_countryFROM invoiceSELECT countryFROM customerSELECT countryFROM employee;SELECT billing_countryFROM invoiceUNIONSELECT countryFROM customerUNIONSELECT country

Result sets of SELECT statements from two or more queries are combined using the UNION operator.…

Answered: Which of the following statements would…

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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Question

Which of the following statements would create a UNION between all of the countries we have customers, employees, or invoices in?

SELECT country
FROM invoice
UNION
SELECT country
FROM customer
UNION
SELECT country
FROM employee;
SELECT billing_country
FROM invoice
SELECT country
FROM customer
SELECT country
FROM employee
UNION;
SELECT billing_country
FROM invoice
SELECT country
FROM customer
SELECT country
FROM employee;
SELECT billing_country
FROM invoice
UNION
SELECT country
FROM customer
UNION
SELECT country

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