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PostgreSQL Exam PGCES-02 Topic 11 Question 38 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 38
Topic #: 11
[All PGCES-02 Questions]

A table is defined as follows: CREATE TABLE t (id INT, val TEXT); Select two correct statements from below about the function "get_head" defined below. CREATE

FUNCTION get_head(BOOLEAN) RETURNS TEXT LANGUAGE sql CALLED ON

NULL INPUT AS 'SELECT val FROM t WHERE $1 OR id > 0 ORDER BY id LIMIT 1;';

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Suggested Answer: A, D

by Devorah at Jan 09, 2023, 01:14 PM

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Howard
2 months ago
This question is making my head spin! I bet the exam writer is having a good laugh at our expense. Anyway, I'm sticking with C and D, they seem the most reasonable to me.
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Dulce
16 hours ago
User1
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Tamra
4 days ago
I agree with you, C and D seem like the most reasonable choices.
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Lottie
9 days ago
I believe A is incorrect, but C and D make sense to me.
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Clorinda
14 days ago
I'm not sure about B, but I agree with C and D.
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Mickie
18 days ago
Yeah, D makes sense too. Let's go with C and D for our answers.
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Mickie
23 days ago
I agree with you on C. I also think D is correct because the returned values may not be the same.
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Blythe
28 days ago
I think C and D are correct too.
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Mickie
1 months ago
I think C is correct because when NULL is passed, NULL is returned.
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Noah
2 months ago
I believe statement E is true because having a function with the same name and parameter type can cause an error.
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Truman
2 months ago
Wait, is this a trick question? What if the table is empty? In that case, the function would return NULL, so C is definitely correct. As for the other statement, I'll go with D - it sounds like it could return different values even with the same parameter.
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Adolph
1 months ago
User 2
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Anika
1 months ago
User 1
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Lucille
2 months ago
I agree with statement D because the function might not always return the same value.
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Ashleigh
2 months ago
I'm a bit stumped on this one. Is the function going to return the first row based on the id, or the first row where the condition is true? I guess I'll go with C and D, just to be safe.
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Mollie
2 months ago
I think statement C is correct because if NULL is passed, NULL is returned.
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Glendora
2 months ago
This is a tricky one! I'm going to say B and D are the correct statements. The function could return multiple lines if there are multiple rows with id > 0, and the returned value might change if the table is updated between function calls.
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Teri
2 months ago
I agree, and D is also correct because the returned value might change between function calls.
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Teri
2 months ago
I think B is correct because the function could return multiple lines.
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Vanesa
2 months ago
Hmm, if the function is called with NULL input, it should return NULL, so C is correct. But I'm not sure about the other statement, let me think about it.
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Nohemi
2 months ago
The function is not defined using PL/pgSQL, it's using SQL language. I'm going with C and D.
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