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PostgreSQL PGCES-02 Exam - Topic 5 Question 87 Discussion

Select one incorrect statement concerning the relational data model.
D) It is made up of a multiple stage hierarchy where each of the set elements has parent child relationships.
A) It expresses the real world in a collection of 2-dimensional tables called a relation.
B) It is a model based on set theory.
C) It has a logical structure independent of physical data structure.
E) It is a model that was proposed by E.F . Codd in 1970.

PostgreSQL PGCES-02 Exam - Topic 5 Question 87 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 87
Topic #: 5
[All PGCES-02 Questions]

Select one incorrect statement concerning the relational data model.

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Suggested Answer: D

by Iraida at Jul 03, 2025, 04:39 PM

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Anna
7 months ago
Wait, are we sure about E? Codd's work was groundbreaking!
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Hollis
7 months ago
Totally agree with Willow, D is the odd one out.
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Lakeesha
7 months ago
A is correct, that's how relations work!
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Laquita
7 months ago
B is spot on, set theory is the foundation of this model.
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Willow
7 months ago
D sounds off, relational models aren't hierarchical.
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Cornell
8 months ago
I thought all the other options were accurate, but D really stands out as the odd one out.
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Lisbeth
8 months ago
I practiced a similar question, and I feel like the hierarchy mentioned in D doesn't fit with how relations work.
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Dominga
8 months ago
I'm not entirely sure, but I remember something about E.F. Codd proposing the model, so E might be correct.
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Carmen
8 months ago
I think option D sounds wrong because the relational model is more about tables than hierarchies.
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Helaine
8 months ago
Option A sounds right to me - the relational model does express the real world in 2-dimensional tables.
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Golda
9 months ago
I remember the relational model has a logical structure independent of the physical data structure, so I'll rule out option D.
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Veda
9 months ago
The relational model was proposed by Codd in 1970, so option E seems like the correct answer.
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Carri
9 months ago
Hmm, I'm a bit confused about the hierarchy part. I'll have to think through that one carefully.
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Nancey
9 months ago
I'm pretty sure the relational data model is based on set theory, so I'll go with option B.
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Valentin
11 months ago
I disagree, I think the incorrect statement is A because the relational data model does not necessarily have to be represented in 2-dimensional tables.
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Rashida
11 months ago
I believe the correct answer is D as well, because the relational data model is not based on a hierarchy.
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Wynell
11 months ago
Wow, D really threw me off. Hierarchy? In a relational model? That's as off-base as a fish on a bicycle!
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Noemi
10 months ago
B) It is a model based on set theory.
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Lemuel
11 months ago
A) It expresses the real world in a collection of 2-dimensional tables called a relation.
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Gene
12 months ago
I agree with Yan, D is incorrect because the relational data model does not have a multiple stage hierarchy.
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Norah
1 year ago
Option E is the one - Codd proposed the relational model back in 1970, that's a classic fact.
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Kristofer
1 year ago
A and B sound spot on to me. Can't go wrong with those choices.
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Florencia
11 months ago
E) It is a model that was proposed by E.F . Codd in 1970.
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Corazon
12 months ago
D) It is made up of a multiple stage hierarchy where each of the set elements has parent child relationships.
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Laila
12 months ago
C) It has a logical structure independent of physical data structure.
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Yan
1 year ago
I think the incorrect statement is D.
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Shakira
1 year ago
Option D is definitely incorrect. The relational model doesn't have a hierarchy structure, it's all about tables and relationships between them.
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Mary
11 months ago
C) It has a logical structure independent of physical data structure.
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Ailene
12 months ago
B) It is a model based on set theory.
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Delsie
12 months ago
A) It expresses the real world in a collection of 2-dimensional tables called a relation.
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