ITPEC IP October 2018 Question 3
ITPEC IP October 2018 — Question 3 of 100
A check digit is appended so input errors in the customer code can be detected. A validation calculation is performed on the entered code and compared with the appended digit. A mismatch indicates that one or more characters were probably entered incorrectly.
Answer (a)
Why not others:
- acquisition order requires a sequence number or date
- identifying a customer quickly requires an appropriate lookup key or index
- grouping by area or another attribute requires classification information in the code or record
Key rule: A check digit provides error detection for identifiers; it does not encode business meaning or determine record order.
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