Entity relationship

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Economy & Finance Business

Relationship degree
- Indicates the number of
entities or participants
association with a
relationship.

Three types of
Relationship degree

1. Unary relationship
2. Binary relationship
3. Ternary relationship

1. Unary relationship
- Exist when an association is
maintained within a single entity.

“Recursive
Relationship”

2. Binary relationship
- Exist when two entities are
associated in a relationship.

3. Ternary relationship
- Exist when three entities are associated. Although
higher degrees exist, they are rare and are not
specifically named.

1. A DOCTOR writes one or more PRESCRIPTIONs.
2. A PATIENT may receive one or more PRESCRIPTIONs.
3. A DRUG may appear in one or more PRESCRIPTIONs.

“Recursive Relationship”

-Is one in which a relationship can
exist between occurrences of the
same entity set.

For example:
1:M UR “an EMPLOYEE may manage many EMPLOYEEs,
and each EMPLOYEEs managed by one EMPLOYEE”

1:1 UR “an EMPLOYEE may be married to one and only
one other EMPLOYEE”

M:N UR “ a COURSE may be a prerequisite to many other
COURSEs, and each COURSE may have many other
COURSEs as prerequisites.

1:1 UR “an EMPLOYEE may be married to
one and only one other EMPLOYEE”

Unary relationship are common
in manufacturing industries…

Implementation of the recursive relationship
“PART contains PART”

The M:N recursive relationship might be
more familiar in a school environment…

The 1:M recursive relationship
“EMPLOYEE manages EMPLOYEE”

Participation as described is bidirectional, meaning
that it must be addressed in both directions along
the relationship.

•Must every employee have a spouse who is
an employee?

•Must every employee be spouse to
another employee?

“NO” … it is possible to be an
employee and not have another
employee as a spouse. Also it
possible to be an employee and
not be the spouse of another
employee…

Associative (composite) Entities
-In the original ERM described by Chen,
relationships do not contain attributes.
-The associative entity is used to
implement a M:N relationship between
two or more entities.
-Also known as a “Composite or Bridge
entity”

Similar to Entity relationship

Storch, “Moral Relationships Between Nurse and Client: The Influence of Metaphors” Storch is doing two distinct, but related things in this piece. She is both analyzing and critiquing the common metaphors used to discuss the moral relationship between a nurse and a client as well as use them to determine the best way to think about this relationship. She is considering the metaphors used to discuss this relationship and the nature of metaphors themselves. The latter is important for both the analysis and critique as well as determining a satisfactory metaphor. A metaphor is a figure of speech where we treat one thing as if it were another thing both for comparison and elucidation purposes (e.g., and Juliet is the sun) (179). Metaphors help us grasp things that may be more foreign to us using something that is more familiar, and they are also used to sharpen our thinking about the lesser known object. The problem with metaphors is that, since the objects/relationships being compared are distinct, the metaphor will include too much or too little, often excluding what is important or including something that hinders us from thinking about the object clearly or both. The most common metaphor of the nurse-client relationship is the nurse as a surrogate mother. The metaphor is powerful in both directions. In the positive sense, it provides us with core ethical commitments of a nurse to his or her client: a relationship based upon trust, integrity, promise-keeping, dedication, and nurturance (181). But there are two problems with this metaphor. Being a mother or parent is something universal: it is something any of us can do and does not require, in and of itself, specific knowledge. But being a nurse does require specialized knowledge to engage in the practice. In other words, the moral features of the relationship are not necessarily what define a nurse by itself but rather necessary features of a nurse to perform their work well. Second, as should be suspected, this metaphor of nurse as surrogate mother influences us to assume that all nurses are female or should be female or is a feminine profession (one way to make the distinction here is between strictly thinking in terms of biological sex, female, and how we think of gender in any given society, here, what is feminine as opposed to masculine). We can see that this view influences another powerful metaphor, although one that is largely detrimental, of nurse as servant. This reduces the nurse to something like a household maid, something that a nurse is not, although certain parts of the profession could be easily confused with the occupation of a servant. Storch emphasizes that it is important to think of nursing as a profession, meaning, it has specific knowledge and set of skills that take time and training to acquire. But Storch points out that this is limiting as well. The technical skills of a nurse mean little if they are not performed with the right care and refle.

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Key Principles of Human Communication Several important principles about the nature of human communication must be considered when communicating strategically in organizational settings. Let's examine four of the most important of these principles. Principle 1: Communication Is a Process Perhaps the most important principle is that communication is a process. Communication does not start and stop; it is continuous, dynamic, ongoing, and cumulative. Whenever we create and respond to messages—either internally or externally generated messages—and create meanings in response to these messages, we are engaging in the process of communication. Since we send messages to ourselves and to others all the time (whether intentionally or unintentionally), and we are constantly creating meanings to help us make sense of our world, the communication process surrounds us all the time. It is as though we were swimming in an ocean of messages and meanings. Communication engulfs us and is the primary adaptive process of living. Principle 2: Communication Is Irreversible We discussed earlier how every time we communicate, we reflect on the meanings we create for the messages we perceive by contrasting new information with information we have gained from previous communication events. In this way, communication is a step-by-step, iterative building process. This means that communication is irreversible. Once we say something to someone, we can't take it back. Every communication event is likely to have influences on all future communication events. For example, if you falsely accuse a coworker of leaving from work too early, you could apologize and ask the person to please disregard your accusation. However, it is not likely that the coworker will forget the accusation, even if it's a relatively minor point. It will be indelibly stamped in his or her memory, and this communication event will frame all future interactions and your relationship with this person. This suggests that the messages we send to others in organizational settings are likely to influence all future meanings these people create about us. This is why it is important to be judicious about what we communicate to others. The messages we send influence future communication as well as the nature of our relationships with others. Principle 3: Communication Is Transactional Communication is more than just a series of actions or interconnected interactions between communicators. Communication is transactional. In that sense, there is really no such thing as "one-way" communication. By its very nature, all communication is interactive, and meanings are negotiated jointly; messages do not exist independent of each other in a vacuum. Transactional communication implies that when we analyze communication situations, both as senders and as receivers of messages, we need to take into account the many factors that influence the communication process, such as the settings in which communication occurs, ...

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Running Head: LETTER OF ADVICE 1 Letter of Advice Student’s Full Name COM 200: Interpersonal Communications Instructor:1 Use Full Date – September 24, 2015 1 Please use your instructor’s full name. Purpose: Use this sample Final Paper for a better understanding of what is present in a high quality Final Paper: Letter of Advice. We’ve included these elements of constructive criticism to demonstrate that even “A” quality work still receives comments to improve the student’s thinking and writing on the topic. Please note that this paper was written when a slightly different set of learning objectives were being used in this class. Be sure you use the learning objectives listed in the final paper prompt. See the footnotes at the bottom of each page for information about what the student has done well in this assignment and also some areas for improvement. LETTER OF ADVICE 2 Dear Cassy and Jeremy, Congratulations on your recent engagement. It’s such a great time in your life. My wife and I have been married almost 8 years. I also just took a class on interpersonal communications and would love to share with you some of what I learned in addition to some personal experiences.2 Knowing how your partner communicates and uses verbal and non-verbal communication is important in a relationship and will help in reducing miscommunications. Know going in to your marriage that there will be conflict but learning how to manage or resolve those conflicts will help in a successful marriage. I know you both love each other very much and that will help get you through those difficult times.3 Interpersonal Relationships4 Interpersonal relationships are part of our everyday life. Getting married forms one of the most important interpersonal relationships you will ever have. But with any relationship there are barriers to effectively maintain those interactions. Our self-concept is developed through our interpersonal relationships and changes over time. Emotional intelligence also has a great impact on how effective a relationship will be. The amount an individual discloses of themselves in a relationship can vary depending on the type of relationship and can have both negative and positive effects. Interpersonal conflict is probably one of the most challenging aspects of a relationship and managing these conflicts effectively is important to the relationship’s wellbeing. 2 While we usually discourage people from using the first person, this essay asks that the student write a personal letter, so it is okay to be more casual here 3 This is a good introduction. It would be even stronger with a more definitive thesis statement. The Writing Center has a great “Thesi.

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Entity relationship

1. Relationship degree - Indicates the number of entities or participants association with a relationship.

2. Three types of Relationship degree 1. Unary relationship 2. Binary relationship 3. Ternary relationship

3. 1. Unary relationship - Exist when an association is maintained within a single entity. “Recursive Relationship”

4. 2. Binary relationship - Exist when two entities are associated in a relationship.

5. 3. Ternary relationship - Exist when three entities are associated. Although higher degrees exist, they are rare and are not specifically named.

6. Three types of relationship degree

7. 1. A DOCTOR writes one or more PRESCRIPTIONs. 2. A PATIENT may receive one or more PRESCRIPTIONs. 3. A DRUG may appear in one or more PRESCRIPTIONs.

8. “Recursive Relationship” -Is one in which a relationship can exist between occurrences of the same entity set.

9. For example: 1:M UR “an EMPLOYEE may manage many EMPLOYEEs, and each EMPLOYEEs managed by one EMPLOYEE” 1:1 UR “an EMPLOYEE may be married to one and only one other EMPLOYEE” M:N UR “ a COURSE may be a prerequisite to many other COURSEs, and each COURSE may have many other COURSEs as prerequisites.

10. 1:1 UR “an EMPLOYEE may be married to one and only one other EMPLOYEE”

11. Unary relationship are common in manufacturing industries…

12. Implementation of the recursive relationship “PART contains PART”

13. The M:N recursive relationship might be more familiar in a school environment…

14. The 1:M recursive relationship “EMPLOYEE manages EMPLOYEE”

15. Participation as described is bidirectional, meaning that it must be addressed in both directions along the relationship. •Must every employee have a spouse who is an employee? •Must every employee be spouse to another employee?

16. “NO” … it is possible to be an employee and not have another employee as a spouse. Also it possible to be an employee and not be the spouse of another employee…

17. Associative (composite) Entities -In the original ERM described by Chen, relationships do not contain attributes. -The associative entity is used to implement a M:N relationship between two or more entities. -Also known as a “Composite or Bridge entity”

18. Example of Bridge .

Entity relationship

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