Examine the differences and similarities between Synthetic main key; primary composite key partnership; connection
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Examine the differences and similarities between
Synthetic main key; primary composite key
partnership; connection
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- Was cardinality ever used as a representation of anything in an entity-relationship diagram? 1:The unique identifier that is used to store data 2:The maximum number of entity instances that may be used in a connection 3:The total number of primary keys associated with an object. 4:The total number of attributes possessed by an entityDescribe how the multivalued attribute of an E-R diagram is transformed into relationsPrepare an E-R diagram for a real estate firm that lists property for sale. Identify all entities (supertype/subtype), attributes (optional/required), unique identifiers, relationships and relationships cardinality and optionality. Resolve any M-M relationship you find. • The firm has several sales offices in several states. Each sales office has Office_Number and a Location. • Employees are assigned to work in different sales offices. Each employee has an ID and Name. • An employee must be assigned to only one sales office. For each sales office, there is always one employee assigned to manage that office. For each manager we record the start date of the management job. • The firm lists properties for sale. Each property has an ID, description and Location. Each unit of property must be listed with one (and only one) of the sales offices. A sales office may have any number of properties listed. • Each unit of property has one or more owners. owners have ID and Name. An owner may own…
- What are the rules for choosing how to recognize and create connections between entities in the ER-Model?Draw an entity relationship diagram ERD using unified modelling language UML nation according to the below business rules. your design should be logical level-including primary and foreign key fields and remember to remove any many-to-many relationships. 1. all entities should have surrogate primary keys. 2.A customer can place many orders over and over time and each order is placed by exactly one customer. 3.The name and surname of a customer must be stored in the database 4.The date and status of an order must be stored in the database 5.Each order cab obtain many items and each item can be part of many different orders 6.The name description and unit price of every item must be stored in the database 7.When an item is added to an order, the quality ordered and the unit price of thr item must be stored 8.Each item in the database belongs to a catagory and a catagory has many items that belong to it 9.The name of each of the categories must be stored in the databaseWhat exactly are entity-relationship diagrams, and how do they come into play? What kind of symbol is utilized to represent a relationship? What is an associative entity, and how does it work? Give an illustration of your point.
- Distinguish between a composite key and an attribute that is made up of many components. An ERD should be able to identify each of these.Assess the differences and similarities betweenIn contrast to the main key, the composite keyconnection; affiliation; kinshipexplain and differentiate between strong entities and weak entites and juxtaposed with strong relationship and weak relationship.
- What does the term "cardinality" refer to in an ERD? One: The information is stored in relation to a single item. Maximum number of entity instances in a connection 3:The sum of an entity's main keys number of features possessed by a thingIdentify all the important concepts represented in the library database case study described below. In particular, identify the abstractions of classification (entity types and relationship types), aggregation, identification, andspecialization/generalization. Specify (min, max) cardinality constraints whenever possible. List details that will affect the eventual design but that have no bearing on the conceptual design. List the semantic constraints separately. Draw an EER diagram of the library database.q21
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