FC0-U71 Data and Database Fundamentals Practice Question
A database administrator wants to enforce that every record in the 'Orders' table must have a non-null unique value in the 'OrderID' column. Which database concept ensures this?
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
✓
Entity integrity
Entity integrity requires a primary key to be unique and not null for each row.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Referential integrity
Why it's wrong here
Referential integrity ensures foreign key relationships are valid.
- ✓
Entity integrity
Why this is correct
Entity integrity is enforced by the primary key constraint.
- ✗
Input validation
Why it's wrong here
Input validation is a front-end check, not a database integrity concept.
- ✗
Domain integrity
Why it's wrong here
Domain integrity ensures column values conform to data types and constraints.
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