You can modify a primary key in [!INCLUDEssnoversion] by using [!INCLUDEssManStudioFull] or [!INCLUDEtsql]. You can modify the primary key of a table by changing the column order, index name, ...

Learn how to define primary and foreign keys in a MYSQLi database using SQL and PHP. Also, learn how to check, modify, and delete primary and foreign keys in MYSQLi.

If you are working with SQL DB2, you may need to create tables that have primary and foreign keys to enforce data integrity and establish relationships between different entities.

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