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An entity set may not have sufficient attributes to form a primary key is called weak entity set. One with primary key is called strong entity set.
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Can weak entity be converted into strong entity in DBMS?
A weak entity set can always be make into strong entity set by adding to its attribute of its identifying entity set. For a weak entity set, we add columns to the table corresponding to the primary key of the strong entity set on which the weak set is dependent.
When is the concept of weak entity used in data modelling?
A weak entity can be identified uniquely only by considering the primary key of another (owner) entity.
Difference between traditional and latest DBMS package?
Traditional FPS and DBMS both are different from each other. In DBMS there is security of data as well as integrated data while this is not in FPS.
Concept of file handling in DBMS?
if we need a modifying ,sreach,delete a file so we need a DBMS
What is er model in dbms?
In software engineering, an Entity - Relationship model(ER model for short) is an abstract and conceptual representation of data. Entity-relationship modeling is a database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion. Diagrams created by this process are called entity-relationship diagrams or ER diagrams.learn more www.ngprakasam.hpage.com
Why do we need weak entity sets?
why do we need weak entity in database when we can make it strong entity?
Can weak entity be converted into strong entity in DBMS?
A weak entity set can always be make into strong entity set by adding to its attribute of its identifying entity set. For a weak entity set, we add columns to the table corresponding to the primary key of the strong entity set on which the weak set is dependent.
What is difference between generalization and specialization in DBMS?
DBMS: Data Base Management Systemgeneralization and specialization are important relationships that exist betweena higher level entity set and one or more lower level entity sets.1. generalization is the result of taking the union of two or more lower level entity sets to produce a higher level entity sets.specialization is the results of taking subsets of a higher level entity set to form a lower level entity sets.2. In generalization,each higher level entity must also be a lower level entity.In specialization,some higher level entities may not have lower-level entity sets at all.3. Specialization is a Top Down process where as Generalization is Bottom Up process.
What is week entity sets?
In a relational database, a weak entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction with its attributes to create a primary key.Wikipedia
What is meant by specialization in dbms?
Specialization in DBMS refers to the process of dividing a superclass into multiple subclasses based on specific characteristics. Each subclass inherits attributes and relationships from the superclass, allowing for more specific data modeling and organization. Specialization helps to represent complex data structures in a more organized and efficient manner.
What is meant by specialization dbms?
the process of designating subgroupingswithin an entity set
Explain the difference between a weak and a strong entity set?
An entity set that does not possess sufficient attributes to form a primary key is called a weak entity set. One that does have a primary key is called a strong entity set. The discriminator (or partial key) of a weak entity set is the set of attributes that distinguishes among all the entities of a weak entity set The existence of a weak entity set depends on the existence of a identifying entity set. It must relate to the identifying entity set via a total, one-to-many relationship set from the identifying to the weak entity set We depict a weak entity set by double rectangles in E-R diagram. We underline the discriminator of a weak entity set with a dashed line in E-R diagram.
What is strong and weak entity set?
the enitity which is set primary key is said to be strong entity and the entity which does not set primary key is said to be weak entity.
Give entity relation diagram for hospital system in dbms?
d_id,d_name
Can weak entity be converted into strong entity?
The primary key of a weak entity set is formed by taking the primary key of the strong entity set on which its existence depends (see Mapping Constraints) plus its discriminator. A strong entity set has a primary key. All tuples in the set are distinguishable by that key. A weak entity set has no primary key unless attributes of the strong entity set on which it depends are included. Tuples (a particular row) in a weak entity set are partitioned according to their relationship with tuples in a strong entity set. Tuples within each partition are distinguishable by a discriminator, which is a set of attributes.
When is the concept of weak entity used in data modelling?
A weak entity can be identified uniquely only by considering the primary key of another (owner) entity.
How do you convert an entity relationship diagram to a table?
converting er diagram to table in dbms?
