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1. Identify the entity type. In this question, the entity type is relationships. 2. Identify the cardinality of the entity type. In this question, the cardinality is two. 3. Calculate the ERC. The ERC is 2. 4. Calculate the GEC. The GEC is 4.
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Which database shows parent-child relationship? A. relational B. distributed C. hierarchical D. analytic
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We were given a question about the parent child relationships in the database. We are supposed to know that this is a proper question for activists. The database shows the parent child relationship. It's okay. Among the options, we can see that there are more distributed er analytical. Okay, so we can appreciate the fact that there is a database. It's okay. The database shows Karen's relationships. It means what we can expect from this point on. Which option is best? We can also mention option A. This is all about the last answer. Thank you for taking the time to respond.
Correct answer is (b) Maximum cardinality
Easy explanation - In SQL (Structured Query Language), the term cardinality refers to the uniqueness of data values contained in a particular column (attribute) of a database table.
Question Answer
► MCQ Exam ON : Data Modeling with ER Model
Which of the following indicates the maximum number of entities that can be involved in a relationship?
| 1) | ERD | |
| 2) | Maximum cardinality | |
| 3) | Minimum cardinality | |
| 4) | Greater Entity Count (GEC) | |
| 5) | NULL |
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Answer: The E-R model is basically made up of entities, attributes and relationships. Entities represent the things people want to keep track of, such as customers and products. Each "thing" is presented by an entity or entity class—in this case CUSTOMER and PRODUCT. Individual members of each entity class are called entity instances—for example
CUSTOMER John Smith and PRODUCT Canned Tomato Soup. Each entity is described by a set of attributes. For example, a CUSTOMER will have a CustomerNumber, a LastName and a FirstName, while a PRODUCT will have a ProductNumber and a Description. These, of course, have specific values for each entity instance. Finally, the entities are connected by relationships. There are relationship classes between entity classes and relationship instances between entity instances. For example, in general a
CUSTOMER buys a PRODUCT, and a PRODUCT is sold to a CUSTOMER. Specifically, CUSTOMER John Smith buys a PRODUCT Canned Tomato Soup.
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