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PostgreSQL Exam PGCES-02 Topic 9 Question 25 Discussion

Actual exam question for PostgreSQL's PGCES-02 exam
Question #: 25
Topic #: 9
[All PGCES-02 Questions]

A table is defined as below. Select the most suitable description about the foreign key constraint. CREATE TABLE master (id INTEGER PRIMARY KEY, name TEXT); CREATE TABLE record (id INTEGER REFERENCES master (id), count INTEGER);

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Suggested Answer: A

by Veronika at May 07, 2022, 02:41 AM

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Valda
1 months ago
I'm just impressed they managed to fit all this into a single exam question. That's some serious database compression right there!
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Ty
1 days ago
B) If the 'record' table contains a row with an 'id', no change can be made at all to the corresponding 'id' row in the 'master' table.
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Carri
1 days ago
C) If the 'record' table contains a row with an 'id', the corresponding 'id' row in the 'master' table cannot be deleted.
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Leah
2 days ago
B) If the 'record' table contains a row with an 'id', no change can be made at all to the corresponding 'id' row in the 'master' table.
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Julie
13 days ago
A) If any row exists in the 'record' table, no change can be made to the 'master' table.
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Karma
16 days ago
A) If any row exists in the 'record' table, no change can be made to the 'master' table.
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Cammy
22 days ago
Exactly, it's a way to link the two tables together and prevent any inconsistencies.
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Tanesha
26 days ago
So, basically, the foreign key constraint ensures that you can't delete a record in the 'master' table if it's being referenced in the 'record' table.
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Latonia
28 days ago
I agree, that sounds right. It's all about maintaining data integrity.
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Fanny
1 months ago
I think the answer is C) If the 'record' table contains a row with an 'id', the corresponding 'id' row in the 'master' table cannot be deleted.
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Verdell
1 months ago
Option E? Really? These are perfectly valid SQL statements. Someone needs to brush up on their database knowledge.
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Avery
2 months ago
Haha, good thing the 'record' table doesn't have a column called 'count_of_beers'. That would be a whole different kind of foreign key constraint!
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Dominic
28 days ago
C) If the 'record' table contains a row with an 'id', the corresponding 'id' row in the 'master' table cannot be deleted.
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Nickole
29 days ago
A) If any row exists in the 'record' table, no change can be made to the 'master' table.
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Dion
2 months ago
I agree with Stephane. This is a classic example of a foreign key constraint, which prevents orphaned records in the dependent table.
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Stephane
2 months ago
Option C is the correct answer. The foreign key constraint ensures that the corresponding row in the master table cannot be deleted if there is a reference to it in the record table.
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Gilbert
2 months ago
Hmm, that makes sense too. It's important to understand the implications of foreign key constraints in database design.
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Leonida
2 months ago
I disagree, I believe the answer is A. The foreign key constraint prevents any changes to the master table if a row exists in the record table.
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Gilbert
2 months ago
I think the answer is C. The foreign key constraint ensures that the corresponding row in the master table cannot be deleted.
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