DA0-002 Data Concepts and Environments Practice Question
A data analyst is profiling a dataset of employee records. The birthdate column contains values stored as text in the format YYYY-MM-DD, while the hire date column is stored as a native date type. The analyst needs to calculate employee tenure. Which action should the analyst take first?
⚠ Common exam trap
The trap here is assuming that all date-related columns must be converted before any calculation, when the column needed for tenure is already correctly typed.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Calculate the difference between the hire date and the current date
Tenure is the elapsed time between an employee's hire date and the present. Because the hire date is already stored as a native date type, the analyst can compute the difference directly without any conversion. The birthdate column's text format is a separate data quality issue that does not affect the tenure calculation and should not block it.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Convert the hire date column from native date to text to match the birthdate column
Why it's wrong here
Converting a properly typed date column to text would degrade data quality and prevent date arithmetic. Native date types support functions like DATEDIFF that text strings do not. Aligning formats by weakening the better-typed column is the opposite of what a data analyst should do, and it would make tenure calculation harder rather than easier.
- ✓
Calculate the difference between the hire date and the current date
Why this is correct
Tenure measures how long an employee has been with the organization, which is the interval between the hire date and today. Since hire date is already a native date type, the analyst can directly compute this difference. The birthdate column's text format is irrelevant to the tenure calculation and does not need to be addressed first.
- ✗
Subtract the birthdate from the hire date to derive tenure
Why it's wrong here
Tenure is the time between hire date and the current date, not the difference between birthdate and hire date. Subtracting birthdate from hire date would yield the employee's age at hiring, which is unrelated to tenure. This calculation would produce a meaningless metric for the stated purpose.
- ✗
Convert the birthdate column from text to a native date type
Why it's wrong here
Converting birthdate to a date type is good practice, but tenure is calculated from the hire date, not the birthdate. The hire date is already stored as a native date type, so converting birthdate does not address the immediate calculation. This action, while beneficial for data quality, does not unblock the tenure computation.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.