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PostgreSQL PGCES-02 Exam - Topic 11 Question 58 Discussion

A table named "sample" is defined as below. Select two statements which will generate a constraint error. CREATE TABLE sample ( i INTEGER PRIMARY KEY, j INTEGER,CHECK ( i > 0 AND j < 0 ) );
A) INSERT INTO sample VALUES (1, 0); and D) INSERT INTO sample VALUES (NULL, -4);
B) INSERT INTO sample VALUES (2, -2);
C) INSERT INTO sample VALUES (3, NULL);
E) INSERT INTO sample VALUES (5, -5);

PostgreSQL PGCES-02 Exam - Topic 11 Question 58 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 58
Topic #: 11
[All PGCES-02 Questions]

A table named "sample" is defined as below. Select two statements which will generate a constraint error. CREATE TABLE sample ( i INTEGER PRIMARY KEY, j INTEGER,

CHECK ( i > 0 AND j < 0 ) );

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Suggested Answer: A, D

by Yolando at Apr 11, 2024, 03:25 AM

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Walker
7 months ago
I thought NULL would break it, but I guess not!
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Bettina
8 months ago
B is good too, negative j is okay.
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Kristofer
8 months ago
Wait, C should be fine, right? NULL is allowed!
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Isaac
8 months ago
Totally agree, those values don't meet the CHECK.
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Cassi
8 months ago
A and D will cause errors.
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Jennifer
9 months ago
I believe E should be fine since j is negative, but I’m confused about how NULLs interact with the constraints.
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Thaddeus
9 months ago
I practiced a similar question where the CHECK constraint was tricky. I feel like A might also cause an error since j isn't negative.
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Albert
9 months ago
I'm not sure about C, but I remember something about NULLs not violating CHECK constraints.
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Detra
9 months ago
I think option D will definitely cause a constraint error because of the NULL value for the primary key.
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Karan
9 months ago
Ugh, I'm a bit lost here. I'll have to re-read the question a few times and maybe even sketch it out to make sure I understand.
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Mari
9 months ago
I'm feeling pretty confident about this. I just need to identify which insert statements will violate the constraint.
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Novella
9 months ago
Okay, I think I've got this. The key is the CHECK constraint, which requires i to be greater than 0 and j to be less than 0.
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Thurman
9 months ago
Hmm, this looks tricky. I'll need to carefully read the table definition and think through each of the insert statements.
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Noe
9 months ago
Wait, what about NULL values? I'm not sure how those will interact with the constraint.
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Carmen
9 months ago
The key here is to focus on the specific wording of the question. It's asking about Salesforce functionalities that are ignored, not the ones that are considered. I think the answer is multiple currencies, field-level security, and record type picklist value assignments.
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Ernestine
9 months ago
This looks straightforward, I'll just need to carefully analyze the burndown chart to determine the iteration's status.
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Delfina
9 months ago
Hmm, I'm a bit unsure about this one. I'll need to think it through carefully to make sure I understand the concepts before answering.
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Janey
1 year ago
This is a job for the SQL Ninja! *strikes a dramatic pose* Okay, let's see... The `i` column must be greater than 0, and the `j` column must be less than 0. That means (A) and (D) are the troublemakers here. Time to show off my database kung-fu skills! *cracks knuckles*
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Blondell
1 year ago
Alright, let's do this! Hmm, the `i` column has to be positive, and the `j` column has to be negative. So (A) and (C) are definitely going to fail. Wait, did they say two statements? Guess I better double-check my work. *scratches head* Where's my SQL cheat sheet when I need it?
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Nieves
1 year ago
User 3: And (C) violates the constraint on column j being negative.
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Leontine
1 year ago
User 2: Yeah, (A) violates the constraint on column i being positive.
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Cordelia
1 year ago
User 1: (A) and (C) are definitely going to fail.
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Yaeko
1 year ago
Ah, the joys of database design. Clearly, the table gods have blessed us with a challenge! I'm gonna go with (C) and (D) as the troublemakers here. Null values and CHECK constraints don't always play nicely, you know. But hey, at least it's not a production database, right? *laughs nervously*
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Kimbery
1 year ago
User 3: Always a fun challenge in database design!
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Ashton
1 year ago
User 2: Yeah, null values and constraints can be tricky.
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Gerardo
1 year ago
User 1: I think (C) and (D) are the culprits.
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Jose
1 year ago
Ooh, a tricky one! Okay, let's think this through. The table definition says the `i` column must be greater than 0 and the `j` column must be less than 0. So (B) and (E) should be good, but (A), (C), and (D) are gonna trigger that constraint error for sure. Time to put on my SQL thinking cap!
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Eulah
1 year ago
User1: Right, both (A) and (C) are no-gos for this table.
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Chun
1 year ago
User3: (C) will also trigger the constraint error because of the NULL value.
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Mari
1 year ago
User2: Yeah, because the value of j is not less than 0.
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Cheryll
1 year ago
User1: I think (A) will cause a constraint error.
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Gregoria
1 year ago
User2: Yeah, because the value of j is not less than 0.
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Rozella
1 year ago
User1: I think (A) will cause a constraint error.
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Berry
1 year ago
Well, look at that, an opportunity to show off my SQL prowess! Let's see, the question is which statements will generate a constraint error. Hmmm, I'm thinking (A) and (C) are the ones that will fail. Gotta love those pesky CHECK constraints!
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Dortha
1 year ago
I believe statement D will also generate a constraint error because it has a NULL value for i.
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Dannette
1 year ago
I agree with Rosina. The constraint CHECK ( i > 0 AND j < 0 ) will be violated with statement B.
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Rosina
1 year ago
I think statement B will generate a constraint error.
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