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Tables, Records, Fields, and Keys
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Computer Science
HSCS.205 Tables, Records, Fields, and Keys
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A messaging app considers using phone_number as the primary key for Users. Which concern best argues for a separate user_id?
A
Primary keys must be longer than phone numbers.
B
Phone numbers can change, be reassigned, and expose personal information.
C
A database cannot store phone numbers in any field.
D
Every user always has exactly three phone numbers.
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