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);
Data sharing, maintaining security
<u>Explanation:</u>
Kristian is a cybersecurity professional. She is writing a book called The Door Toward Cybersecurity. Organizations should avoid any data <u>sharing or exchange</u> while servers are transmitting information. This will help organizations keep the information intact and maintain <u>security.</u> If any info or data shared when the servers are transmitting the info, then it may lead to the loss of security, and the information gets leaked. So it must be avoided to share while transmission of info using the servers.
Answer:
There are many types of information al references such as Encyclopedias, dictionaries, thesaurus Almanacs, atlases, thesauruses, Atlases, almanacs, and encyclopedias.
Explanation:
There are also informational websites. The way to find this is to look at the website url to see if it ends in .gov, .edu, and .org . But make sure you cite your source so you don't plagiarize.
If you don't have any questions feel free to ask in the comments.
Answer: The answer is anonymity
Explanation: i had the same question on my test.
Software as a Service cloud model is ideal for Rita’s business. SaaS are office solutions that allow Rita’s small business to work more efficiently and in a more organized way. Most SaaS applications are used for invoicing and accounting, sales, performance monitoring, and overall planning. SaaS applications can save Rita money. They do not require the deployment of a large infrastructure at her location. As a result, it drastically reduces the upfront commitment of resources. Whoever manages SaaS’s IT infrastructure running the applications brings down fees for software and hardware maintenance. SaaS has generally been acknowledged to be safer than most on-premise software.
