Glossary
Primary Key
A primary key is a field in a database table that uniquely identifies each record in that table. It is a fundamental concept in database design, as it ensures the integrity and accuracy of the data stored in the table.
The primary key serves as a link between different tables in a database, allowing for efficient searching and retrieval of data. It is often used as a reference point for other tables to establish relationships and dependencies, ensuring that data is consistent across the entire database.
In order to be effective, a primary key must meet certain criteria. It must be unique, meaning that no two records in the table can have the same value for the primary key field. It must also be non-null, meaning that every record in the table must have a value for the primary key field.
Common examples of primary keys include social security numbers, email addresses, and employee IDs. In some cases, a primary key may be composed of multiple fields, such as a combination of a customer ID and a product ID.
Overall, a primary key is a crucial component of database design, ensuring that data is organized and accessible in a logical and efficient manner. By understanding the role of primary keys, database administrators can create robust and effective databases that meet the needs of their organization.
A wide array of use-cases
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