18 Questions
Which concept is best described as 'a collection of interrelated data'?
Database
Which concept defines the theoretical way of manipulating table contents using relational operators?
Relational Algebra
Which concept is best described as 'enabling programmers to view data logically rather than physically'?
Relational Model
Which concept provides a detailed accounting of all tables found within the user/designer-created database?
Data Dictionary
Which concept is best described as 'the characteristics of entities'?
Attributes
Which concept is best described as 'an entity that can exist apart from one or more related entities'?
Existence independence
Which of the following best describes a Multivalued Attribute in a database?
An attribute that can have many values and nulls
Which of the following is true about a Single-user database?
It supports only one user at a time
What is the definition of an Existence Dependence in a database?
It exists in the database only when it is associated with another related entity occurrence
What type of anomaly is an Update anomaly?
It is a type of anomaly that occurs when changing records
What is the purpose of a Data Manipulation Language (DML) in a database?
It is used to manipulate data in a database
What type of anomaly occurs when entering new records?
Insertion anomalies
What is the definition of a Candidate Key in a database?
It is a superkey without redundancies
What is the purpose of a Super key in a database?
To uniquely identify each row
What does the ROLLBACK command do in a database transaction?
Undoes any changes made during the transaction
What is the main function of a Foreign key in a database relationship?
To match primary key values in related tables
What does a Multi-user database support at the same time?
Multiple users accessing the database concurrently
In which type of join are unmatched values in one table left null?
Outer join
Test your knowledge on ER model concepts including attributes, deletion anomalies, single-user databases, and transactions. Understand the fundamentals of ER diagrams and various attribute types.
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