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PostgreSQL PGCES-02 Exam - Topic 1 Question 79 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 79
Topic #: 1
[All PGCES-02 Questions]

A set of tables are defined as follows: t1 t2 How many rows are returned by executing the following SQL statement? SELECT * FROM t1 LEFT OUTER JOIN t2 USING (id);

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Suggested Answer: A, E

by Janessa at Jan 11, 2025, 08:27 PM

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Renea
6 months ago
I vote for 4 rows, seems like a safe bet!
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Veronika
6 months ago
Wait, are we sure about that? What if t2 has no matches?
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Leanora
6 months ago
I’m pretty sure it’s 3 rows if t1 has 3 and t2 has 2 matching IDs.
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Skye
7 months ago
Definitely! A LEFT JOIN will return all rows from t1.
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Ezekiel
7 months ago
I think it depends on the number of matching IDs in t1 and t2.
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Susy
7 months ago
I’m leaning towards option B, but I feel like I might be mixing up the concepts of INNER JOIN and LEFT JOIN.
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Louvenia
7 months ago
If t1 has 3 rows and t2 has 2 matching rows, I believe it would return 3 rows total. But what if there are no matches?
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Judy
7 months ago
I think I saw a similar question where the LEFT JOIN returned all rows from the left table, but I can't recall the exact numbers.
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Kendra
8 months ago
I remember practicing LEFT OUTER JOINs, but I'm not sure how many rows would actually be returned without knowing the data in t1 and t2.
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Angelyn
8 months ago
This is a good example of why it's important to understand how different SQL join types work. I'll make sure to review my notes on that before the exam.
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Brittani
8 months ago
I'm a little confused by the USING clause here. Does that mean the 'id' column needs to exist in both tables? I'll have to double-check the table definitions to be sure.
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Raina
8 months ago
Okay, let me break this down step-by-step. The LEFT OUTER JOIN will return all rows from the t1 table, plus any matching rows from the t2 table. The USING clause means it will match on the 'id' column. I think I've got this!
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Nana
8 months ago
Hmm, I'm a bit unsure about how the LEFT OUTER JOIN with the USING clause will affect the number of rows returned. I'll need to think this through carefully.
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Charlesetta
8 months ago
This looks like a pretty straightforward SQL query, so I'm feeling confident I can figure this out.
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Gayla
1 year ago
The answer is obviously E) 6 rows. Why? Because the more options, the better the chances of guessing correctly, right? *winks*
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Kenny
11 months ago
I'm sticking with E) 6 rows, more options means better chances!
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Krystina
12 months ago
No, I'm pretty sure it's 5 rows.
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Edelmira
12 months ago
I think the answer is actually 4 rows.
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Quentin
1 year ago
Definitely C) 4 rows. I'm so confident about this that I'm already planning my victory dance.
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Janine
11 months ago
I believe it's D) 5 rows.
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Benton
12 months ago
I agree with C) 4 rows.
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Viola
12 months ago
I'm going with B) 3 rows.
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Aaron
1 year ago
I think it's A) 2 rows.
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Shawnta
1 year ago
Wow, this is a tricky one! I'm going to go with D) 5 rows. Who knows, maybe there's some hidden magic in the database that'll surprise us all.
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Carri
1 year ago
I'm pretty sure the answer is B) 3 rows. The LEFT OUTER JOIN will only return the rows where there is a match between the two tables.
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Nieves
1 year ago
The correct answer is C) 4 rows. The LEFT OUTER JOIN will return all rows from the t1 table, even if there are no matching rows in the t2 table.
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Leanna
1 year ago
Yes, you're right. The LEFT OUTER JOIN will return all rows from t1 table.
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Audra
1 year ago
I think it's 4 rows
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Buddy
1 year ago
I believe the answer is C) 4 rows, as it includes all rows from t1 and t2.
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Luis
1 year ago
I agree with Tijuana, because there are 2 rows in t1 and 1 row in t2.
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Tijuana
1 year ago
I think the answer is B) 3 rows.
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