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explain why the database system would not allow a tuple to be inserted into the database through this view

Sagot :

emilylaird0753
For the view of Exercise 4.18, explain why the database system would not allow a tuple to be inserted into the database through this view.
For reference
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.
OUTER JOIN
select e.ID from employee e left outer join manages m on e.ID = m.ID
where m.manager_id is null;
NO OUTER
select e.ID from employee e where e.ID not in (select m.ID from manages m) or e.ID in (select m.ID from manages m where m.manager_id is null);
Martebi

The database system would not allow a tuple to be inserted into the database through this view because it is  not compatible.

What is compatibility?

The term to be compatible is one where two or more things can work together and not have issues.

Note that in the above scenario, The database system would not allow a tuple to be inserted into the database through this view because it is  not compatible.

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