For the database of Figure 4.12, write a query to find the ID of each employee with no manager. Note that an employee may simply have no manager listed or may have a null manager. Write your query using an outer join and then write it again using no outer join at all.

For the database of Figure 4.12, write a query to find the ID of each employee with no manager. Note that an employee may simply have no manager listed or may have a null manager. Write your query using an outer join and then write it again using no outer join at all.

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

Please answer the attached question!!!!!

4.18
For the database of Figure 4.12, write a query to find the ID of each employee
with no manager. Note that an employee may simply have no manager listed or
may have a null manager. Write your query using an outer join and then write
it again using no outer join at all.

employee (ID, person_name, street, city)
works (ID, сomрапу naте, salary)
сотpany (сomрапу nате, сity)
manages (ID, manager_id)
Figure 4.12 Employee database.

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