An analyst must convert phone numbers from various inputs into a single standard format for a company directory. Which approach leads to accurate results and allows referencing the original values later?
Store the reformatted numbers in a new column alongside the existing column
Keep the original data but adjust parts of the numbers step-by-step
Replace the original records while reformatting numbers
Reformat phone numbers at the end of the pipeline and discard raw data
Placing the reformatted version in a separate column helps preserve the initial data for verification or troubleshooting. Overwriting existing data removes the ability to compare older data with the new standardized formats. Delaying transformations to a later stage can cause misaligned information if earlier operations rely on consistent formats. Splitting transformations in steps may produce inconsistent data if partial changes happen multiple times.
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Why is it important to keep the original data when reformatting phone numbers?
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What are the potential issues with replacing original records while reformatting?
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What does it mean to reformat phone numbers in a step-by-step process, and why is it problematic?