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PostgreSQL PGCES-02 Exam - Topic 9 Question 29 Discussion

Given the following two table definitions, select one SQL statement which will cause an error. CREATE TABLE sample1 (id INTEGER, data TEXT); CREATE TABLE sample2 (id INTEGER);
A) SELECT s1.id FROM sample1 s1;
B) SELECT s1.id FROM sample1 AS s1;
C) SELECT data FROM sample1 AS s1, sample2 AS s2 WHERE s1.id = 1 AND s2.id = 2;
D) SELECT id, data FROM sample1 AS s1, sample2 AS s2 WHERE s1.id = s2.id;
E) SELECT s1.id, s1.data FROM sample1 AS s1, sample2 AS s2 WHERE s1.id = s2.id;

PostgreSQL PGCES-02 Exam - Topic 9 Question 29 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 29
Topic #: 9
[All PGCES-02 Questions]

Given the following two table definitions, select one SQL statement which will cause an error. CREATE TABLE sample1 (id INTEGER, data TEXT); CREATE TABLE sample2 (id INTEGER);

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Suggested Answer: A

by Lezlie at Jul 25, 2022, 01:44 AM

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Dusti
8 months ago
I thought all of them would work, surprised by C!
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Lisandra
8 months ago
D looks fine to me, no errors there.
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Sarah
9 months ago
Wait, why would C cause an error?
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Johna
9 months ago
I agree, C is the one!
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Goldie
9 months ago
Option C will cause an error.
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Polly
9 months ago
I’m leaning towards option E causing an error, but I can't quite remember why.
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Lenora
9 months ago
I practiced a similar question, and I feel like option D should work since it joins on the IDs.
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Luke
9 months ago
I'm not sure, but I remember something about aliases. Maybe option B is problematic?
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Shalon
9 months ago
I think option C might cause an error because it references both tables but doesn't specify how they relate.
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Rupert
9 months ago
I've got a strategy here. Since the question is asking about two true statements, I'll methodically evaluate each option and eliminate the ones that are clearly false. That should help me narrow it down to the right answer.
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Carlene
9 months ago
Hmm, I'm a bit unsure about this one. The options all seem related to evaluating the supplier's quality capabilities, so I'll need to think through which one is the least relevant.
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Virgina
9 months ago
This is tricky, but I think the key is to remember that pairwise testing only requires us to cover all possible pairs of variable values, not every possible combination. So with 6 variables, 4 test cases should be sufficient to cover everything.
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Nieves
9 months ago
Okay, I think I've got this. The key is to configure the payment service for the cash and carry desk, so I'll go with option A.
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Alease
9 months ago
The security test really emphasizes the need for an alternative path, so I might lean toward B too, but I feel uncertain about the details.
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Lilli
10 months ago
Hmm, I'm not sure about this one. I know Synapse has different components, but I'm not familiar with how they work with Cosmos DB. I'll have to think this through carefully.
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Lillian
1 year ago
Hey, at least they didn't throw in a table called 'sample3' just to mess with us. That would be too much, even for a certification exam!
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Roy
1 year ago
User 3: I agree, the tables don't have the same columns.
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Josphine
1 year ago
Yeah, that makes sense. Option D is the one that will cause an error.
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Eugene
1 year ago
User 2: I think option D will cause an error.
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Lourdes
1 year ago
User 1: Yeah, that would be too confusing.
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Raina
1 year ago
I agree, the error would occur because there is no 'data' column in sample2.
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Margo
1 year ago
I think option D will cause an error.
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Felix
1 year ago
Hmm, Option C is a bit tricky. Trying to select data where the IDs don't match? That's gotta be a problem.
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Fabiola
1 year ago
I'm going with Option E. Selecting from both tables where the IDs match, and including the data column. Looks good to me!
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Andree
1 year ago
I agree, Option D is the one that would cause an error. It's important to be specific when joining tables.
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Tarra
1 year ago
You're right, Option D would cause an error. It doesn't specify which id to match on between the two tables.
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Lenna
1 year ago
I think Option D would cause an error because it selects id and data from sample1 and sample2 without specifying which id to match on.
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Margarita
1 year ago
Option E is correct. It selects the id and data from sample1 where the id matches in sample2.
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Elina
1 year ago
Great choice! Option E is the correct SQL statement that will not cause an error.
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Lasandra
1 year ago
I agree. Option E is the only statement that includes both tables and the data column.
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Keith
1 year ago
That makes sense. Option E is the only one that joins the tables on the ID column.
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Chauncey
1 year ago
Option E is correct. It selects from both tables where the IDs match and includes the data column.
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Kattie
1 year ago
Hold up, I think Option D might be the one. Trying to select from both tables where the IDs match, but the data column doesn't exist in sample2.
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Azalee
1 year ago
User 2: Yeah, that makes sense. Option D is the one that will cause an error.
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Charlette
1 year ago
User 1: I think you're right, Option D will cause an error because data column doesn't exist in sample2.
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Vivan
1 year ago
Option A seems straightforward enough. Why would that cause an error?
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Stephaine
1 year ago
Option D is correct as it selects id and data columns from sample1 and sample2 where their ids match.
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Lanie
1 year ago
Option C will cause an error because it tries to select the data column from sample1 which does not exist.
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Reyes
1 year ago
Option B is also correct as it uses an alias for the table sample1.
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Herman
1 year ago
Option A is correct because it selects the id column from sample1 without any issues.
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Mireya
1 year ago
Why do you think option C will cause an error?
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Dwight
1 year ago
I disagree, I believe option C is the one that will cause an error.
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Mireya
1 year ago
I think option D will cause an error.
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