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CompTIA Exam DS0-001 Topic 1 Question 7 Discussion

Actual exam question for CompTIA's DS0-001 exam
Question #: 7
Topic #: 1
[All DS0-001 Questions]

Which of the following constraints is used to enforce referential integrity?

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Suggested Answer: B

The constraint that is used to enforce referential integrity is foreign key. A foreign key is a column or a set of columns in a table that references the primary key of another table. A primary key is a column or a set of columns in a table that uniquely identifies each row in the table. Referential integrity is a rule that ensures that the values in the foreign key column match the values in the primary key column of the referenced table. Referential integrity helps maintain the consistency and accuracy of the data across related tables. The other options are either different types of constraints or not related to referential integrity at all. For example, a surrogate key is a column that is artificially generated to serve as a primary key, such as an auto-increment number or a GUID (Globally Unique Identifier); a unique key is a column or a set of columns in a table that uniquely identifies each row in the table, but it can have null values unlike a primary key; there is no such constraint as TID.Reference:CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.


by Shawna at Oct 22, 2023, 04:03 PM

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Laura
8 months ago
I was about to say C) Unique key, but then I remembered that's more for ensuring uniqueness, not referential integrity. Foreign key is the clear winner here. Although, sometimes I wish the exam questions were as straightforward as 'which key is used to enforce referential integrity?' *laughs*
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Rebbecca
8 months ago
Hmm, I was leaning towards D) Primary key at first, but you both make a good point. Foreign key is the way to go for referential integrity. Can't have those dangling relationships, am I right?
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Billy
8 months ago
Definitely B) Foreign key. That's the key that links tables together and ensures we don't have any orphaned records. Gotta keep that data squeaky clean!
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Asha
8 months ago
Ah, the age-old question of enforcing referential integrity! This is a tricky one, but I think the answer is B) Foreign key. That's the constraint that ensures data in one table references valid data in another related table, right?
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