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Consider the database schema below for cities in countries. A country have many cities, and the same city name can be found in different countries. Country (ID: integer, Name: String (unique)) City (serialNo: integer (unique, not null), CountryID: Integer, CityName: String, Population: integer) A city can have unknown CityName?     No, violates domain constraints.     Yes.     No, violates entity Integrity constraint     No, violates key constraint.     No, violates referential integrity constraint.

Consider the database schema below for cities in countries. A country have many cities, and the same city name can be found in different countries. Country (ID: integer, Name: String (unique)) City (serialNo: integer (unique, not null), CountryID: Integer, CityName: String, Population: integer) A city can have unknown CityName?     No, violates domain constraints.     Yes.     No, violates entity Integrity constraint     No, violates key constraint.     No, violates referential integrity constraint.

Database System Concepts
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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  1. Consider the database schema below for cities in countries. A country have many cities, and the same city name can be found in different countries.

    Country (ID: integer, Name: String (unique))

    City (serialNo: integer (unique, not null), CountryID: Integer, CityName: String, Population: integer)

    A city can have unknown CityName?

       

    No, violates domain constraints.
       

    Yes.
       

    No, violates entity Integrity constraint
       

    No, violates key constraint.
       

    No, violates referential integrity constraint.
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