Question: What common element is found in the singleton pattern and
What common element is found in the singleton pattern and the factory pattern? What is the basic difference between the two?
Answer to relevant QuestionsWhat common programming construct is based on the observer pattern?Figure is a system sequence diagram for the use case Record dental procedure in the dental clinic system. Do the following:a. Develop a first-cut sequence diagram, which only includes the actor and problem domain classes.b. ...Review the observer pattern description in Figure. Find the errors in the diagram. After you have identified the errors, state how you would fixthem.What is a database schema? What information does it contain?What is referential integrity? Describe how it is enforced when a new foreign key value is created, when a row containing a primary key is deleted, and when a primary key value is changed.
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