Mnemonic devices improve memory by encoding items in a special way. Mnemonic devices are used in order to help one to improve one's ability to remember a particular information. Its a memory technique that help one's brain to encode and recall important information.
        
             
        
        
        
What is this? i’m not sure what i’m looking at
        
             
        
        
        
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);
        
             
        
        
        
Hey there! 
- The word "<u>verb</u>" simply means <em>'description of an action, assert, or event that is made into the main purpose of your predicate in your judgement' </em>
- Now that we have the definition of the word verb we can answer your question
- "<em>Has</em>" is past tense but it is THIRD person present
-  "<em>Have</em>" is when you own something 
<h2>Answer: 
HAS ✅</h2>
BECAUSE "I SAW last night" 
Note: usually people read the sentence to themselves until it makes easier sense to them or use context clues in the sentence to answer the particular question(s)
Good luck on your assignment and enjoy your day!
~LoveYourselfFirst:)
 
        
                    
             
        
        
        
In a print statement, you can set the End argument to a space or empty string to stop the output from advancing to a new line.
<h3>What is a Print statement?</h3>
A print "statement" is known to be a kind of statement that looks like a call to the make (print) or println process of the System. 
Note that In a print statement, you can set the End argument to a space or empty string to stop the output from advancing to a new line so that it can work properly.
Learn more about  print statement from
brainly.com/question/25220385
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