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E.R. model is an abstract and conceptual representation of data....
it is a graphical representation of entities and their relationship to each other..
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A relationship between the instances of a single entity type is called a ........................?
it is a unary relationship.
What is social construction?
A social construction is any institutionalized entity or cultural artifact in a social system "invented" or "constructed" by participants in a particular culture or society that exists because people agree to behave as if it exists or follow certain conventional rules. One example of a social construct is hierarchy or social status.
How the world born?
Religious people believe that an entity they call God, created the world and there are those who believe that it was born out of the physiochemical interaction of energy and matter.
What is a table and what role does it play in the relational model?
A table is a matrix of intersecting rows and columns. In the relational model, the table view of data makes it easy to spot and define entity relationships, thereby greatly simplifying the task of database design.
What is the difference in studying crime as a social phenomenon and in studying crime as a social behavior?
Studying crime as a phenomenon can be define as studying the issue. Studying crime as its own entity and identifying its patterns and studying behavior means to study the offender.
Explain child Relationships in dbms?
A child relationship refers to an entity or table that cannot exist without the existence of another entity or table. An example of this would be a table that is created to address a many-to-many relationship between two other tables.
Entity relationship model with example?
draw an er diagram on attendance management system
Can a relationship have only one participating entity?
yes. For example, only one person actually "participates" in the stalker/victim relationship.
What is total participation in database management?
Participation (or optionality) concerns the involvement of entities i a relationship. Participation is about exceptions to the rule. An entity's participation is optional if there is a least one instance of an entity which does not participate in the relationship. An entity participation is mandatory if all instances of an entity must participate in the relationship.
Full form of eer model?
ENHANCED ENTITY RELATIONSHIP OR EXTENDED ENTITY RELATIONSHIP
Entity relationship diagram of a portfolio management system?
The entity relationship diagram of a portfolio management system serves as a graphical representation of entities and their relationships to each other in a conceptual database model. In addition, a corresponding data dictionary is developed to explain these relations.
When do you have to use an intersection entity in database?
If you have a many-to-many relationship between two entities you create an intermediate entity between.Now, the relationship between the first entity and intersection entity is one-to-many, and the relationship between the second entity and intersection entity is one-to-many also.
Can an identifying relationship of a weak entity type will be of a degree greater than two give example?
Gust starting out
Entity Relationship diagram for Hotel Reservation System?
An entity relationship diagram for hotel reservation systems is a map of each entity or thing that has a part in the process of hotel reservations. The diagram maps the relationship between each entity of the process.
What is entity relationship diagrame?
An entity relationship diagram (ERD) represents the entities, or groups of information, and their relationships maintained for a business. An entity relationship diagram represents the entities, or groups of information, and their relationships maintained for a business. An entity relationship diagram represents the entities, or groups of information, and their relationships maintained for a business.
What is the difference between total and partial generalization?
the participation of an entity set E in a relationship set R is said to be total if every entity in E participates in at least 1 relationship in R .... if only some entities in E participates in the relationship R then the participation of entity set E in relationship R is said to be partial..... example every loan entity should be related with 1 customer with borrower relationship therefore participation of loan in borrower is full or total..... and it is possible that only some customer entities are related wid to loan entity set through borrower relationship so participation of customer in borrower relationship is partial..... Abhishek jaiswal IEM kolkata
What two conditions must be met before an entity can be classified as a weak entity?
In contrast to the strong or regular entity, a weak entity is one that meets two conditions: 1. The entity is existence-dependent; that is, it cannot exist without the entity with which it has a relationship. 2. The entity has a primary key that is partially or totally derived from the parent entity in the relationship.
