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Detailed explanation of the difference between MySQL primary key and unique key
In a MySQL database, understanding the difference between primary keys and unique keys is critical to optimizing data management. This article will delve into the differences between the two and their application scenarios.
Primary Key
The primary key assigns a unique identifier to each row in the table to ensure its uniqueness. Key features of primary keys include:
Unique key
Unlike primary keys, a table can have multiple unique keys. These keys provide additional mechanisms to ensure data integrity:
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