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Difference between entity and entity set?

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2012-10-26 08:00:09
2012-10-26 08:00:09

Entity - Table

Entity Set - Rows in Table

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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.

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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.

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lets understand them all: 1.An Entity is a real world "thing" which have independent existence. 2.Entity type is a category. 3.entity type is strictly calling, "an instance of entity type". 4.An entity type defines a collection of entities that have the same attributes. 5.Entity set : the collection of all entities of a particular entity type in the database at any point of time is called Entity set.

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The difference between a corporation and a commission is in their functions. A corporation if a government entity that serves the public while a commission is an investigative body set up for a particular task.

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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

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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.

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Strong entity is an entity set that can uniquely identify a row. Weak entity is an entity set that can not identify a row uniquely. Weak entities are denoted by double rectangle box.

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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.

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The insured is the person or entity who is covered by the insurance policy. The insurer is the entity (insurance company)that pays to, or on behalf, of the insured for a covered loss. That which is covered by the policy is set forth in the insurance policy.

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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.

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Data are the raw facts or single entity while informations are the set of data which provide sense to us after processing.

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A weak entity is an entity set that does not have sufficient attributes so that it can form a primary key. A weak entity is depicted by drawing double rectangle in entity relationship diagrams. While a strong entity is an entity set that have sufficient attributes so that it can form a primary key.

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same as entity class or entity type or entity set

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dfd is generally the flow of data , whereas the entity relationship diagram is the relationship between the entities..

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The accounting entity suggests that the owners funds are kept separate from the business's, The legal entity however considers them to be the same account when seizing assets for reasons such as debt

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A legal entity is not a living breathing person, but it can own property, incur debt, etc.

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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.

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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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entity set is term as a collection of logicaly related entities.

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Degree the number of entity types that participate in a relationship.

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a branch is part of the same legal entity. A subsidiary is a distinct legal entity, within a larger company structure.

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In understanding the difference between radiance and luminance it is helpful to catagorize them. Radiance is a physical entity that can be directly measured (units is watts)

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product is variable.but project deals with only single entity.


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