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Difine of describe the terms entity and Attribute?
An entity refers to a distinct object, person, concept, or event about which data is stored. An attribute is a characteristic or property of an entity that describes it or provides more information about it. Attributes help to define the specific details or features of an entity.
Which is an attribute?
An attribute is a characteristic or feature of an object or entity. It helps to describe or define the object by providing specific information about it. Examples of attributes include color, size, shape, and weight.
What is a descriptive attribute?
A descriptive attribute is a characteristic or feature that describes an object, entity, or phenomenon. It provides additional information to help distinguish and define the qualities of the subject being described.
How would you define the property?
an attribute, quality, or characteristic of something.
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.
Each colunm in a database table represets a?
A column in a database represents an attribute to the entity that the table is representing. For example, "hair color" is an attribute if your entity is "customers of a hair salon". This would go in a column of the table (entity) titled "customers" in a management system of a hair salon.
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 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.
primary key?
attribute of an entity which uniquely identifies a specific instance of the data
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 associative entity and relationship with attribute?
A relationship with attributes should be an associative entity when: - All relationships for the associative entity should be many - The associative entity could have meaning independent of the other entities - The associative entity should have attribute(s), but it may or may not have an identifier - The associative entity may participate in other relationships other than the entities of the associated relationship - Ternary relationships should be converted to associative entities
1An attribute which can be used to uniquely identify the individual instances of the entity is?
Primery Key.
