6 Questions
What is the difference between a candidate key and a super key?
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
What is the difference between a candidate key and a super key?
A candidate key is a set of keys that uniquely identifies all rows in a table
What is a composite key?
A set of attributes that uniquely identify every tuple in a table
What is a foreign key used for?
To establish relationships between two tables
What is the purpose of a foreign key?
To establish relationships between two tables and match the referential table's primary key
What is the constraint for a primary key?
Does not allow null values or duplicates
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
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.
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