Quick Answer
The answer is missing a table name and a misspelled or nonexistent column name. These are two of the most common causes of errors when executing a SELECT query because the database engine relies on exact schema references to locate data; if the table is omitted, the system cannot determine which dataset to query, and if a column name is typed incorrectly, it fails to match any field in the table’s definition, triggering errors like “Unknown column” in MySQL or “Invalid column name” in SQL Server. On the CompTIA ITF+ FC0-U61 exam, this tests your understanding of fundamental SQL syntax and the importance of precise naming, often appearing in questions that ask you to identify why a query fails. A common trap is assuming the database will guess the table or correct a typo, but it will not—every element must match exactly. Remember the mnemonic “T-Check”: always verify your Table name and Column spelling before running a SELECT.
This FC0-U61 practice question tests your understanding of database fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are common causes of errors when executing a SELECT query? (Choose two.)
Table is too large
Why wrong: Large tables may cause performance issues but not syntax errors.
Incorrect column name
A misspelled or invalid column name causes an error.
Index is missing
Why wrong: Missing indexes slow queries but do not cause errors.
Missing table name
If the table does not exist or is misspelled, the query fails.
Network is slow
Why wrong: Slow network affects performance, not query execution errors.
Answer choices
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
Option B is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
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.
Related concept
Read the scenario before looking for a memorised answer.
Network is slow
Why it's wrong here
Slow network affects performance, not query execution errors.
Common exam traps
The trap here is that 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.
Detailed technical explanation
When a SELECT query is parsed, the database engine validates all object names against the system catalog (e.g., `INFORMATION_SCHEMA.COLUMNS` in SQL Server). An incorrect column name fails this validation, raising an error before any data access. Missing table name (Option D) also fails validation because the FROM clause is mandatory; without it, the parser cannot determine the source of columns, leading to a syntax error.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Database Fundamentals — This question tests Database Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Incorrect column name — Option B is correct because 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This FC0-U61 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-U61 exam.
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