+A primary key is a crucial field within a [Relational Database](/wiki/Relational_Database) table, designed to ensure the [Uniqueness](/wiki/Uniqueness) of each individual record. It acts as the single, non-null identifier, ensuring data integrity and enabling relationships between tables.
+## See also
+- [Foreign Key](/wiki/Foreign_Key)
+- [Database](/wiki/Database)
+- [Table](/wiki/Table)
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