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.
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What is the difference between a Primary Key and a Foreign Key?
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Can a Primary Key contain more than one column?
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Why is data integrity important when using a Primary Key?