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PostgreSQL PGCES-02 Exam - Topic 2 Question 5 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 5
Topic #: 2
[All PGCES-02 Questions]

Select three SQL statements which return NULL.

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Suggested Answer: A, B, D

by Regenia at May 09, 2022, 05:12 AM

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Peggy
4 months ago
E is just a string, not NULL.
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Glendora
4 months ago
I thought NULL != NULL would return something else?
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Misty
4 months ago
D definitely returns NULL!
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Casie
4 months ago
C returns TRUE, not NULL.
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Alex
4 months ago
A and B will return NULL.
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Glendora
5 months ago
I practiced a similar question, and I think SELECT NULL will return NULL, but I need to double-check the logic on the others.
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Kanisha
5 months ago
SELECT NULL != NULL seems tricky; I feel like it should return NULL too, but I can't recall if that's right.
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Irene
5 months ago
I remember that SELECT NULL IS NULL should definitely return true, so it might not be one of the answers we need.
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Emmanuel
5 months ago
I think SELECT 0 = NULL will return NULL, but I'm not entirely sure about the others.
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Maxima
5 months ago
I think the correct answer is B - enter the receipt as an unidentified receipt. That seems like the most appropriate option when you don't have enough information to identify the customer or invoice.
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Vinnie
5 months ago
Hmm, I'm a bit unsure about this one. I know testing is important, but I'm not sure if it's considered part of the requirements specification phase specifically. I'll have to think this through carefully.
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Mitsue
5 months ago
I'm a little confused by this question. The options don't seem to fully capture the essence of company policies. I'll have to review my notes and see if I can figure out the best answer.
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Darnell
5 months ago
Okay, let's see. The options mention bracket, desktop, and wall installation, as well as "Flip." I'm not sure what "Flip" means in this context, so I'll focus on the more common installation methods.
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Alease
5 months ago
Okay, I think I see what's going on. The issue is likely with trying to push elements into a queue that's constructed from a vector. I'll need to double-check the requirements for the queue container.
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