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Questions and Answers
What is a primary key in a database?
What is a primary key in a database?
- A type of view that exists independently from base tables.
- A collection of interrelated data organized into rows and columns.
- A combination of attributes that can uniquely identify tuples within a relation. (correct)
- A non-key attribute derived from another table.
Which statement accurately describes a foreign key?
Which statement accurately describes a foreign key?
- It is a key that allows for primary keys to be duplicated within a table.
- It is always the primary key of the current table.
- It is derived from a candidate key of the same table.
- It is a non-key attribute whose values come from the primary key of another table. (correct)
What defines the degree of a relation in a database?
What defines the degree of a relation in a database?
- The collection of interrelated data organized into rows and columns.
- The number of attributes in a relation. (correct)
- The number of tuples in a relation.
- The set of one or more attributes that can uniquely identify tuples.
Which of the following correctly describes a view in a database?
Which of the following correctly describes a view in a database?
What is the cardinality of a relation?
What is the cardinality of a relation?
Which of these roles does an alternate key play in a database?
Which of these roles does an alternate key play in a database?
What does a domain in the context of a database refer to?
What does a domain in the context of a database refer to?
Which statement correctly defines a candidate key?
Which statement correctly defines a candidate key?
How is a tuple defined in the realm of databases?
How is a tuple defined in the realm of databases?
A foreign key can only reference the primary key of its own table.
A foreign key can only reference the primary key of its own table.
A candidate key is a single attribute that can uniquely identify tuples in a relation.
A candidate key is a single attribute that can uniquely identify tuples in a relation.
The degree of a relation refers to the number of tuples within that relation.
The degree of a relation refers to the number of tuples within that relation.
An alternate key is simply another name for a primary key.
An alternate key is simply another name for a primary key.
The primary key is a subset of the candidate key within a relation.
The primary key is a subset of the candidate key within a relation.
A view is a permanent table that stores data in a database.
A view is a permanent table that stores data in a database.
The cardinality of a relation indicates how many different attributes it has.
The cardinality of a relation indicates how many different attributes it has.
A tuple is synonymous with a record in a database table.
A tuple is synonymous with a record in a database table.
The domain of a column is a set of values that can appear in that column.
The domain of a column is a set of values that can appear in that column.
Study Notes
Database Management Systems
- DBMS stands for Database Management System, software for storing, maintaining, and utilizing databases.
- RDBMS stands for Relational Database Management System, a type of DBMS that organizes data into related tables.
Databases
- A database is a collection of interrelated data organized into rows and columns, accessible for multiple applications.
- A database system serves as a computer-based record-keeping system.
Key Attributes in Databases
- A Primary Key uniquely identifies tuples in a relation, composed of one or more attributes.
- Candidate Keys are all attribute combinations within a relation that can function as a primary key.
- An Alternate Key is a Candidate Key that is not selected as the primary key.
Relationships Between Tables
- A Foreign Key in a table (A) is a non-key attribute whose values are derived from the primary key of a different table (B).
Table Structures
- A View is a virtual table generated from one or more base tables, not existing independently.
- A Domain is a collection of possible values from which actual column values are selected.
- A relation is represented as a table in a database.
Data Representation
- A Tuple represents a row in a table, also referred to as a Record.
- An Attribute is a column in a table, often called a Field.
- Degree indicates the number of attributes in a relation.
- Cardinality refers to the number of tuples present in a relation.
Database Management Systems
- DBMS stands for Database Management System, software for storing, maintaining, and utilizing databases.
- RDBMS stands for Relational Database Management System, a type of DBMS that organizes data into related tables.
Databases
- A database is a collection of interrelated data organized into rows and columns, accessible for multiple applications.
- A database system serves as a computer-based record-keeping system.
Key Attributes in Databases
- A Primary Key uniquely identifies tuples in a relation, composed of one or more attributes.
- Candidate Keys are all attribute combinations within a relation that can function as a primary key.
- An Alternate Key is a Candidate Key that is not selected as the primary key.
Relationships Between Tables
- A Foreign Key in a table (A) is a non-key attribute whose values are derived from the primary key of a different table (B).
Table Structures
- A View is a virtual table generated from one or more base tables, not existing independently.
- A Domain is a collection of possible values from which actual column values are selected.
- A relation is represented as a table in a database.
Data Representation
- A Tuple represents a row in a table, also referred to as a Record.
- An Attribute is a column in a table, often called a Field.
- Degree indicates the number of attributes in a relation.
- Cardinality refers to the number of tuples present in a relation.
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Description
This quiz covers fundamental concepts of Database Management Systems (DBMS) and Relational Database Management Systems (RDBMS). It explores essential definitions, the structure of databases, and key elements like primary keys and database systems. Test your understanding of these critical topics in database management.
