employee (ID, person_name, street, city) works (ID, company_name, salary) company (companyлате, сity) manages (ID, managerid)

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.

Extracted text: employee (ID, person_name, street, city) works (ID, company_name, salary) company (companyлате, сity) manages (ID, managerid)