What is the MOST appropriate way to update the email address for a user named 'John Doe' in a database, knowing that there may be multiple users with that name, but each user has a unique identifier (UserID)?
Use an UPDATE statement to change the email address where the UserID matches John Doe's unique identifier.
Issue a SELECT command to find all users named 'John Doe' and update the email address individually for each record returned.
Use an UPDATE statement that changes the email address where the user's first name is 'John' and the last name is 'Doe'.
Use an UPDATE statement with the correct email address where the UserName is 'jdoe'.
The correct approach to updating a user's email address when there are potential duplicates in user names is to use the unique identifier to specify which 'John Doe' should have the email address updated. The email address is not a unique identifier and updating based on name alone could result in updating the wrong person if there are multiple users with the same name. The UserID, which is unique for each user, must be used in the WHERE clause of the UPDATE statement to precisely target the correct record.
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Why is it important to use a unique identifier like UserID instead of just using the name for updates?
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Can you explain what an UPDATE statement is and how it functions in a database?
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What could be the consequences of not using the UserID and mistakenly updating the wrong email address?