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Every row in a customer table needs one field that identifies it uniquely. That field is the:
ASort index
BBackup file
CForeign key
DPrimary key
Answer & Solution
Correct answer: D. Primary key
1. No two rows may share it.
2. It identifies each entry.
3. It is the primary key.
_Source: OpenStax Foundations of Information Systems, Chapter 3, Database Management Systems._
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