How can the database be remapped by changing the key?

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To remap the database by changing the key, the following steps can be taken:

1. Identify the current primary key of the table(s) that need remapping.

2. Create a new column for the new key.

3. Update the new column with unique values.

4. Update any foreign key references to the old key to reference the new key.

5. Remove the old primary key and any related indexes.

6. Make the new column the primary key and create any necessary indexes.

7. Test the remapped database thoroughly to make sure all data is still accessible and accurate.

Note: It is important to backup the database before making any changes to ensure that data can be restored in case of any issues. Additionally, any applications or programs that use the database should be updated to reflect these changes.