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What occurs when a weak entity does not have a candidate key and its instances are indistinguishable without a relationship with another entity?
When a weak entity lacks a candidate key and its instances cannot be uniquely identified without a relationship to another entity, it relies on that relationship to establish its identity. This typically occurs in a one-to-many relationship where the weak entity’s existence is dependent on the strong entity, which provides the necessary identifying attributes. As a result, the weak entity will often include a foreign key from the related strong entity as part of its primary key. Without this relationship, instances of the weak entity would be indistinguishable and cannot be adequately represented in the database.
Can a relational database support one to one?
Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.Yes. A one to one relationship is one of the types of relationships a relational database can have.
Why do we need weak entity sets?
why do we need weak entity in database when we can make it strong entity?
What are predicates that define correct database states and relationship with in database?
schema
What is DBMS relationship?
1.what is a Relationship in database management system?
Ternary relationship in database?
mnnk
Distinguish between a relation and a relationship in database?
Relation is one record in the database or a tuple. Relationship is that how tables are connected to each other.
A schematic of the entire database that describes the relationships in a database is called?
entity-relationship diagram.
What is a connection within the data in a database?
relationship
What is the difference between relationship type and relationship instance in database?
In a database, a relationship type defines the abstract structure and constraints of how entities are related, including cardinality and participation rules. In contrast, a relationship instance represents a specific occurrence of that relationship type, linking actual records in the database. Essentially, the relationship type serves as a blueprint, while the relationship instance is the tangible connection between entities in the data.
Binary relationship in database?
A binary relationship is a type of relationship between the entities, which links to types of entities in it.
How are relationship between tables expressed in a relational database?
Tables are the basic building blocks of a relational database.
