Contents
Which stores relationship among data entities?
Logical: This level comprises the information that is actually stored in the database in the form of tables. It also stores the relationship among the data entities in relatively simple structures.
When more than one instance of an entity is linked with the relationship?
When more than one instances of an entity is associated with more than one instances of another entity then it is called many to many relationship. For example, a can be assigned to many projects and a project can be assigned to many students.
Which of the following indicates the maximum number of entities can be involved in a relationship?
Discussion Forum
| Que. | Which of the following indicates the maximum number of entities that can be involved in a relationship? |
|---|---|
| b. | Maximum cardinality |
| c. | ERD |
| d. | Greater Entity Count (GEC) |
| Answer:Maximum cardinality |
What does one to one relationship in database mean?
A one to one (1:1) relationship is the relationship of one entity to only one other entity, and vice versa. It should be rare in any relational database design. In fact, it could indicate that two entities actually belong in the same table.
How to establish one to many relationship in Entity Framework?
After applying the conventions for one-to-many relationship in the entities above, the database tables for Student and Grade entities will look like below, where the Students table includes a foreign key GradeId . We want to establish a one-to-many relationship where many students are associated with one grade.
What does it mean to have multiple entities in one document?
Whether you store multiple entity types within a single document takes a bit more thought. This is commonly referred to de-normalizing (capturing relationships between data by embedding data in a single document) and normalizing (capturing relationships between data by creating weak links to o other documents) your data.
Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved by use of the Include method. For example, the queries below will load blogs and all the posts related to each blog. C#.