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FC0-U71 Practice Question: Which TWO of the following are valid SQL…

Which TWO of the following are valid SQL functions used to aggregate data?

⚠ Common exam trap

It's easy for candidates to confuse SQL clauses (like ORDER BY for sorting) or scalar functions (like LENGTH) with aggregate functions, because they see them used in queries but fail to recognize the fundamental difference between row-level operations and set-level summarization.

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

✓

COUNT

COUNT and SUM are both aggregate functions in SQL. COUNT returns the number of rows in a result set or the number of non-NULL values in a column, while SUM calculates the total sum of a numeric column. These functions operate on a set of rows and return a single summary value, which is the defining characteristic of aggregate functions in SQL.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    COUNT

    Why this is correct

    COUNT returns the number of rows in a result set.

  • ✗

    SORT

    Why it's wrong here

    SORT is not an aggregate function; ORDER BY is used for sorting.

  • ✓

    SUM

    Why this is correct

    SUM returns the total sum of a numeric column.

  • ✗

    LENGTH

    Why it's wrong here

    LENGTH returns the length of a string, not an aggregate.

  • ✗

    APPEND

    Why it's wrong here

    APPEND is not a SQL function.

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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.