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attribute is a charactarestic of an entity.For example,student entity is there in which we may have student id,course,phoneno,addrs....stuedent id,course,phone no.,addrs are attributes as an individuals but they represent the charactarestics of student entiy
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What is superkey?
it is a set one or more attribute,that taken collectively allow as to idendify uniquly and entity in entity set. ex-customer-id,
What is the difference between a number and a constant?
Constant is referred to numbers that stay the same, particularly in experiment/studies. A number is any form of entity that is counted. For example, 5, 3 billion....etc...
What is the connection between Satan and Damien?
Satan is an evil entity and the name Damien is a satanic name used by the occult.
What field makes the best primary key?
The field or combination of fields, the latter is called a composite key, which uniquely identifies a record. Often people use an integer automatically assigned at record creation, however, if possible it is best, to try for a field which is a unique attribute of the entity a table is describing.
What is the definition for rate of change?
If an entiry is dependent on another entity in a certain way then the change in value of the dependent entity to an unit change in the value of the independent entity is the rate of change.
What is the difference between a reporting entity and a taxable entity?
the difference between a reporting entity and a taxable entity is, a reporting entity is the company or organization and the taxable entity is the individual.
What is the difference between associative entity and relationship with attribute?
An associative entity is used to represent a many-to-many relationship between two or more entities in a database, while a relationship with attribute represents additional information or properties about the relationship itself. In other words, an associative entity helps in resolving many-to-many relationships, while a relationship with attribute adds details about the connections between entities.
Difference between single valued and multivalued attribute?
single value attribute is one that holds a single value for a single entity. example:- name, roll_number... multivalued attribute is one that holds multiplevalues for a single entities. example:- degree(phd, mca)
How would you define Entity and Attribute?
Entity is real world thing,person,place,event or object about which store data in database. Attribute are the characteristics of entity is called attribute.
Difference between entity and entity set?
Entity - Table Entity Set - Rows in Table
What are key attribute and non key attribute?
Attributes can be classified as identifiers or descriptors. Identifiers, more commonly called keys or key attributes uniquely identify an instance of an entity. If such an attribute doesn't exist naturally, a new attribute is defined for that purpose, for example an ID number or code. A descriptor describes a non-unique characteristic of an entity instance. An entity usually has an attribute whose values are distinct for each individual entity. This attribute uniquely identifies the individual entity. Such an attribute is called a key attribute. For example, in the Employee entity type, EmpNo is the key attribute since no two employees can have same employee number. Similarly, for Product entity type, ProdId is the key attribute. There may be a case when one single attribute is not sufficient to identify entities. Then a combination of attributes can solve this purpose. We can form a group of more than one attribute and use this combination as a key attribute. That is known as a composite key attribute. When identifying attributes of entities, identifying key attribute is very important.
What is key attribute and entity in database?
The attribute (or combination of attributes) that is unique for every entity instance e.g.: the account number of an account, the employee id of an employee etc.
What is the difference between a Proposer and the Insured?
the difference between a proposer and the insured is that a proposer is a person or an entity who is seeking insurance and an insuerd is someone or an entity covered by an insurance policy
What is a more common name for attribute?
An attribute is a characteristic or property of an entity, and is also referred to as a field or column.
What is difference between primary key and foreign key?
A primary key is an attribute (or combination of attributes) that uniquely identifies each row in a relation. A primary key is designated by underlining the attribute name. The primary key of an entity set allows us to distinguish among the various entities of the set. A foreign key is an attribute in a relation of database that serves as the primary key of another relation in the same database.
What is the difference between the class and the entity?
A class is a type. An entity is a object created from this type. A class is like a definition and the entity behaves as per this definition.
What is the difference between a deity and an entity?
all i know is that diety is a god
