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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.
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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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