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The MCQ: A set of one or more attributes that collectively, allow us to identify uniquely a tuple in the relation, is known as; "Database Keys" App Download [Free] with answers: unique key, special key, super key, and primary key for master degree in computer science. Practice Database Keys Quiz Questions, download Apple e-Book (Free Sample) for online software development courses.
Database Keys Questions and Answers PDF Download
A set of one or more attributes that collectively, allow us to identify uniquely a tuple in the relation, is known as
- Unique key
- Special key
- Super key
- Primary key
No two tuples in a relation are allowed to have exactly the same value for
- Some attributes
- All attributes
- Some tuple
- All tuples
Specifying tuples within a given relation, are expressed in terms of the
- Attributes
- Variables
- Function
- Domain
A superkey may contain extraneous
- Attributes
- Keys
- Instances
- Entries
The values of the attribute values of a tuple must be such that they can uniquely identify the
- Instance
- Entity
- Relation
- Tuple
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Database Keys MCQs Book Questions
- As an example to find set of all courses taught in Fall 2009 or in Spring 2010, or both, operation to be used is
- A protocol that requires each transaction to be executed in two or three different phases in its lifetime, is called
- Attributes are listed that are desired to appear in result list as a subscript to
- Number that database system uses for communication, is called
- Operation that allows combining of two relations by merging pairs of tuples, one from each relation, into a single tuple, is known to be