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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 difference between a whole one and three tenths?
A whole one represents a complete unit or entity, while three tenths (3/10) is a fractional part of a whole, specifically representing 30% of it. In numerical terms, a whole one equals 1, whereas three tenths equals 0.3. Thus, the difference between them is 0.7, indicating that three tenths is significantly less than one whole.
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 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
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)
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.
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 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 the difference between attribute and domain?
An attribute is a characteristic or property of an entity in a database, representing a specific piece of data, such as a person's name or age. A domain, on the other hand, defines the set of permissible values that an attribute can take, essentially establishing the constraints on the data type and range. For example, an attribute might be "age," while its domain could specify that valid values are integers between 0 and 120. Thus, attributes describe the data, while domains constrain the data.
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.
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.
What is the difference between for stored attribute and derived attribute?
A stored attribute is a data field that is physically saved in the database, representing actual information about an entity, such as a person's age or name. In contrast, a derived attribute is not stored directly but is calculated or derived from other stored attributes, like calculating a person's age from their birthdate. Stored attributes provide direct access to data, while derived attributes offer insights based on existing information.
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.
