CompTIA
DA0-002 · Question #3
DA0-002 Question #3: Real Exam Question with Answer & Explanation
The correct answer is B. Appending. When multiple files have identical structures but contain different data entries, appending them is the correct method to combine them into a single dataset. This operation stacks the rows of each file vertically.
Data Acquisition and Preparation
Question
A data analyst receives four files that need to be unified into a single spreadsheet for further analysis. All of the files have the same structure, number of columns, and field names, but each file contains different values. Which of the following methods will help the analyst convert the files into a single spreadsheet?
Options
- AMerging
- BAppending
- CParsing
- DClustering
Explanation
When multiple files have identical structures but contain different data entries, appending them is the correct method to combine them into a single dataset. This operation stacks the rows of each file vertically.
Common mistakes.
- A. Merging (or joining) combines data horizontally based on common key columns, which is not suitable when the goal is to stack similarly structured data.
- C. Parsing involves analyzing a string or data stream to extract components or interpret its structure, which is not the primary method for combining entire files.
- D. Clustering is a machine learning technique used to group similar data points together, not a method for combining files into a single structure.
Concept tested. Data consolidation, appending data
Topics
#Data combination#Appending data#Data preparation#File unification
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