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Mastering Primary Keys and Database Constraints

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Mastering Primary Keys and Database Constraints

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Questions and Answers

What is the difference between a candidate key and a super key?

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.

What is the difference between a candidate key and a super 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

What is a composite key?

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

What is a foreign key used for?

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

What is the purpose of a foreign key?

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

What is the constraint for a primary key?

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

Study Notes

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

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Description

Do you know everything about primary keys and database constraints? Test your knowledge with this quiz! Learn about super keys, candidate keys, alternate keys, and foreign keys. Understand the importance of composite keys and the restrictions of primary key constraints. Challenge yourself with questions about table relationships and the intricacies of database design. Put your skills to the test and see how well you know the fundamentals of primary keys and constraints.