hardMultiple SelectObjective-mapped
FC0-U71 Practice Question: Which TWO of the following are common causes of…
Which TWO of the following are common causes of errors when executing a SELECT query? (Choose two.)
⚠ Common exam trap
Many candidates confuse performance issues (large table, missing index, slow network) with actual query execution errors, but only syntax or schema mismatches (incorrect column name, missing table name) cause the query to fail.
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
✓
Incorrect column name
A SELECT query references specific columns in the WHERE clause or SELECT list; if the column name is misspelled or does not exist in the table schema, the database returns an error (e.g., 'Unknown column' in MySQL or 'Invalid column name' in SQL Server). This is a fundamental syntax error that prevents query execution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Table is too large
Why it's wrong here
Large tables may cause performance issues but not syntax errors.
- ✓
Incorrect column name
Why this is correct
A misspelled or invalid column name causes an error.
- ✗
Index is missing
Why it's wrong here
Missing indexes slow queries but do not cause errors.
- ✓
Missing table name
Why this is correct
If the table does not exist or is misspelled, the query fails.
- ✗
Network is slow
Why it's wrong here
Slow network affects performance, not query execution errors.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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 FC0-U71 exam.