Mastering Primary Keys and Database Constraints

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Download our mobile app to listen on the go

Get App

A candidate key is a set of keys that uniquely identify all rows in a table, while a super key identifies records uniquely in a table
A candidate key cannot have repeating values, while a super key is a set of attributes that uniquely identify every tuple in a table
A candidate key identifies rows uniquely and is used to select the primary key, while a super key is a set of keys that uniquely identify all rows in a table (correct)
A candidate key is a key that was not selected as the primary key, while a super key establishes relationships between two tables and must match the referential table's primary key.

A super key identifies records uniquely in a table
A candidate key is a set of keys that uniquely identifies all rows in a table (correct)
A super key is used to select the primary key
A candidate key uniquely identifies all rows in a table

A key that was not selected as the primary key
A key that establishes relationships between two tables and must match the referential table's primary key
A set of attributes that uniquely identify every tuple in a table (correct)
A set of keys that uniquely identify all rows in a table

To establish relationships between two tables (A) Signup and view all the answers

To establish relationships between two tables and match the referential table's primary key (A) Signup and view all the answers

Does not allow null values or duplicates (A) Signup and view all the answers

Flashcards are hidden until you start studying

Primary key identifies records uniquely in a table
Super key is a set of keys that uniquely identify all rows in a table
Candidate key identifies rows uniquely and is used to select the primary key
Alternate key is a key that was not selected as the primary key
Foreign key establishes relationships between two tables and must match the referential table's primary key
Composite key is a set of attributes that uniquely identify every tuple in a table
Primary key cannot have repeating values
PK constraint does not allow null values or duplicates
A table can have only one primary key constraint
Primary key values cannot be changed by a foreign key