easyMultiple Choice
FC0-U71 Practice Question: A database administrator wants to enforce that a…
A database administrator wants to enforce that a column only accepts whole numbers. Which data type should be used?
⚠ Common exam trap
Watch out — candidates often confuse FLOAT with INTEGER, assuming FLOAT can store whole numbers, but FLOAT always permits decimal places, which violates the 'whole numbers only' constraint.
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
✓
Integer
The INTEGER data type is specifically designed to store whole numbers without fractional components. In database systems, enforcing a column to accept only whole numbers requires a data type that disallows decimal points, which INTEGER does by definition. Using INTEGER ensures data integrity by rejecting any non-integer input, such as 3.14 or 'abc'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Integer
Why this is correct
Integer stores whole numbers only, rejecting fractional values at the storage layer. Numeric or decimal would accept decimals, and character types accept any text, so Integer is the only type that enforces the column constraint the administrator requires.
- ✗
String
Why it's wrong here
A String column stores arbitrary text, so digits, letters and symbols all pass validation, failing the whole-number constraint. It is tempting because numeric-looking identifiers such as phone numbers or postcodes are legitimately stored as strings when leading zeros or formatting must be preserved.
- ✗
Boolean
Why it's wrong here
Boolean holds only true/false, so it cannot represent values like 7 or 42, failing the whole-number requirement. It is tempting because it does enforce a strict domain, and it would be the correct choice for a column recording a yes/no flag such as whether an account is active.
- ✗
Float
Why it's wrong here
Float stores fractional values with decimal precision, so it cannot enforce whole numbers; integer is the type that restricts a column to whole numbers. Float is tempting when numeric storage is needed, but it permits decimals and risks rounding.
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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.