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Write a SQL statement to create a table named countries including columns country_id, country_name and region_id and make sure that the country_id column will be a key field which will not contain any duplicate data at the time of insertion.

Write a SQL statement to create a table named countries including columns country_id, country_name and region_id and make sure that the country_id column will be a key field which will not contain any duplicate data at the time of insertion.

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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Can you help mewith these SQL queries. I have attached the questions below

Write a SQL statement to create a table named including country_id, country_name and region_id and make sure that the country_id column will be a key field which will not contain any duplicate data at the time of countries columns insertion. • Write a SQL statement to create a table job_history including columns employee_id, start_date, end_date, job_id and department_id and make sure that, the employee_id column does not contain any duplicate value at the time of insertion and the foreign key column job_id contain only those values which are exists in the jobs table. Write a SQL statement to create a table employees including columns employee_id, first_name, last_name, job_id, salary, commission, manager_id and department_id and employee_id column does not contain any duplicate value at the time of insertion and the foreign key columns combined by department_id and manager_id columns contain only those unique combination values, which combinations are exists in the departments table. email, phone_number hire_date, make sure that, the
Transcribed Image Text:Write a SQL statement to create a table named including country_id, country_name and region_id and make sure that the country_id column will be a key field which will not contain any duplicate data at the time of countries columns insertion. • Write a SQL statement to create a table job_history including columns employee_id, start_date, end_date, job_id and department_id and make sure that, the employee_id column does not contain any duplicate value at the time of insertion and the foreign key column job_id contain only those values which are exists in the jobs table. Write a SQL statement to create a table employees including columns employee_id, first_name, last_name, job_id, salary, commission, manager_id and department_id and employee_id column does not contain any duplicate value at the time of insertion and the foreign key columns combined by department_id and manager_id columns contain only those unique combination values, which combinations are exists in the departments table. email, phone_number hire_date, make sure that, the
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