DA0-002 Data Governance Practice Question
Exhibit
Refer to the exhibit. ERROR: Duplicate entry '12345' for key 'PRIMARY' Query: INSERT INTO customers (customer_id, name, email) VALUES (12345, 'John Doe', 'jdoe@example.com');
Refer to the exhibit. A data analyst receives this error when running a data load script. What is the most likely cause?
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
✓
The customer_id 12345 already exists in the table
The error message states 'Duplicate entry '12345' for key 'PRIMARY'', indicating that a record with customer_id 12345 already exists in the table. Option A (email too long) would produce a data truncation error, not a duplicate key error. Option B (connection lost) would result in a connection timeout or similar error. Option D (name field null) could cause a constraint violation if the column is not nullable, but the specific error here is a primary key violation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The email field is too long
Why it's wrong here
This would cause a different error, not a primary key violation.
- ✗
The database connection is lost
Why it's wrong here
Connection loss would give a different error message.
- ✓
The customer_id 12345 already exists in the table
Why this is correct
The error indicates duplicate primary key value.
- ✗
The name field is null
Why it's wrong here
Null values in non-key fields do not cause primary key errors.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.