In a database table, what is the BEST description of a 'Primary Key'?
A tool to enhance the speed of data retrieval within the table.
A column that uniquely identifies each record within the table.
A column that is used to establish a link between two tables.
A combination of two or more columns to guarantee a unique record identifier.
A 'Primary Key' is a unique identifier for each record in a table, ensuring that no two rows have the same value in this column. This uniqueness is crucial for quickly locating individual records and maintaining data integrity. While a 'Foreign Key' is used to link two tables together, and a 'Composite Key' combines multiple columns to create a unique identifier, the primary key's main role is to provide a unique ID for each row in its own table. 'Indexes' are used to improve search performance but are not unique identifiers for records.
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
All IT & Cybersecurity Package plans include the following perks and exams .
Our pricing is simple. Full access to all certifications and exams in each package, for one price.
As many practice tests for as many topics as you want.
Use study mode non-stop, no limits.
Access to our AI assistant, Bash, trained to help you pass your exam.
Track your scores over time in study mode and report cards.
See how you improve over time, and where you need to focus.
Access our store with even bigger discounts than before.
Unlimited access to all performance questions and be prepared for the real thing.
All IT & Cybersecurity Package plans include unlimited access to the following study materials.
Create an account or sign in to access our study materials.