COMPUTER SCIENCE AND ENGINEERING
DATABASE MANAGEMENT SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Domain
|
|
|
Relation
|
|
|
Degree
|
|
|
Metadata
|
Detailed explanation-1: -The set of all possible values of data items is called domain. A relational table’s column structure is defined by a domain. In a domain, there exist values.
Detailed explanation-2: -The domain of a column describes the constraints and identifies the set of valid values that attributes (columns) can assume. The purpose of a domain is to guard the semantic integrity of the data in the model; that is, to ensure that it reflects reality in a sensible way.
Detailed explanation-3: -In computing, the attribute domain is the set of values allowed in an attribute.
Detailed explanation-4: -Domains are data type definitions that resolve to a primitive data type or another domain. In relational database terminology, a domain defines the permitted range of values for an attribute of an entity.
Detailed explanation-5: -Each column of a relational table is defined on a domain. A domain is a set of values. A datatype, which is also defined for each column, consists of a domain of values and a set of operations on those values.