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PostgreSQL PGCES-02 Exam - Topic 8 Question 57 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 57
Topic #: 8
[All PGCES-02 Questions]

The "sample" table consists of the following data: How many rows are returned by executing the following SQL statement? SELECT DISTINCT ON (data) * FROM sample;

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Suggested Answer: C

by Irma at Mar 21, 2024, 05:56 PM

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Corrie
6 months ago
Not sure about this one, could be more than 5 rows too!
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Nguyet
6 months ago
Yeah, I agree with Sage, 3 sounds right.
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Dacia
6 months ago
Wait, how can it be 4 rows? That seems off.
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Twana
7 months ago
Definitely 2 rows!
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Sage
7 months ago
I think it returns 3 rows.
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Walton
7 months ago
I’m leaning towards option A, but I can't recall if DISTINCT ON counts all duplicates or just the first occurrence. This is tricky!
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Jutta
7 months ago
I feel like I might be overthinking this. If the sample table has 4 rows total and 2 of them are duplicates, maybe it returns 3?
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Paris
7 months ago
I remember practicing a question like this, and I think it was about counting unique rows. If there are 3 unique values, then it should return 3 rows, right?
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Corrina
8 months ago
I think the DISTINCT ON clause will return only unique values based on the "data" column, but I'm not sure how many unique values we have in the sample table.
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Selma
8 months ago
This is a good SQL question to test our understanding of the DISTINCT ON clause. I think I've got a handle on it, so I'll give it my best shot.
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Franchesca
8 months ago
I'm a bit confused by the DISTINCT ON syntax here. I'll need to review some examples to make sure I understand how it works before answering this.
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Marguerita
8 months ago
Okay, let me break this down step-by-step. The DISTINCT ON clause will return the first row for each unique value in the "data" column. So I just need to count the number of unique "data" values to get the answer.
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Bettina
8 months ago
Hmm, this looks like a tricky SQL question. I'll need to think through the DISTINCT ON clause carefully to figure out how many unique rows it will return.
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Alpha
8 months ago
Ah, the DISTINCT ON statement - a classic SQL gotcha. I'll need to carefully consider the data structure to determine the number of unique rows returned.
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Malissa
8 months ago
Okay, let me see here. I think the CMDB Use Case Modelar might be the right choice, since it's specifically focused on managing CIs and use cases. But I'm not 100% sure, so I'll need to double-check the details.
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Della
8 months ago
The key here is that we need to sign out users from the primary location, so I think the answer is going to be either A or B. I'll try to remember the differences between those two cmdlets.
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Janessa
8 months ago
This seems like a straightforward question about securing PDF reports. I think I'll go with option C - selecting the 'Secure this Report' option in the report properties.
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Iesha
1 year ago
This question is making my head spin! I'm going to go with my gut and choose A. 2 rows. Gotta love those tricky SQL queries, am I right?
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Leonida
12 months ago
I'm going with 5 rows, it seems like the most logical choice.
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Cassie
1 year ago
I'm pretty sure it's 4 rows, not 2 or 3.
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Clorinda
1 year ago
I think it's actually 3 rows, not 2.
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Bea
1 year ago
E) 6 rows? Really? That can't be right. I'm sticking with B. 3 rows. It's the most logical answer based on the DISTINCT ON clause.
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Jeannetta
12 months ago
I'm not sure about 4 rows. I think it might be 3 rows because DISTINCT ON will return unique values.
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Craig
12 months ago
I agree with you. I also think it's 4 rows. The DISTINCT ON clause will eliminate duplicates.
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Kris
12 months ago
I think it's 4 rows. The DISTINCT ON clause will return unique values based on the 'data' column.
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Eden
1 year ago
Haha, this question is a classic SQL brain-teaser! I'm going with C. 4 rows. Let's see if I can outsmart the exam writers.
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Norah
1 year ago
Oh, I was sure it was D. 5 rows. But now I'm not so sure. I need to review my SQL basics again.
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Rossana
11 months ago
I think it might be 6 rows.
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Glory
12 months ago
I remember it being 2 rows.
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Andree
1 year ago
I'm pretty sure it's 3 rows.
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Allene
1 year ago
I think it's actually 4 rows.
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Quiana
1 year ago
I think the correct answer is B. 3 rows. The DISTINCT ON clause will return the first row for each distinct value of the 'data' column.
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Jesus
1 year ago
I think it might be C. 4 rows.
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Jesus
1 year ago
I agree, the answer is B. 3 rows.
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Joseph
1 year ago
I agree with Catalina, the answer is C) 4 rows. The DISTINCT ON clause will return unique values based on the specified column.
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Catalina
1 year ago
I disagree, I believe the answer is C) 4 rows because DISTINCT ON eliminates duplicates.
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Darrin
1 year ago
I think the answer is B) 3 rows.
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