正解:A
The dataset exhibits inconsistencies in both the CustomerID and Date columns:
* CustomerID Column: The identifiers use various formats, including underscores (Tre_234), slashes (215
/Tre), hyphens (Tre-345), and combinations of letters and numbers (TREJD19). This inconsistency can lead to difficulties in data retrieval and analysis.
* Date Column: Dates are presented in multiple formats, such as YYYY-MM-DD (2022-09-08), MM/DD
/YYYY (08/02/2021), YYYY/MM/DD (2021/06/20), MM-DD-YYYY (12-26-2021), DD/MM/YYYY (31/08/2022), and an unconventional format (2022'08/01). Such variability can cause errors in date computations and analyses.
Addressing these inconsistencies is essential to ensure data quality and reliability.
Reference: CompTIA Data+ Certification Exam Objectives (DA0-001), Domain 1.4: Ensure data quality.