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Consider the following relation definition:
STUDENT(
Student_Number: integer NOT NULL
Name: variable length character string length 20 NOT NULL)
Primary Key Student_Number
HOUSING(
Housing_ID: integer NOT NULL
Student_Number: integer NOT NULL
Building: variable length character string length 25 NOT NULL)
Primary Key Housing_ID
Foreign Key Student_Number References
STUDENT(Student_Number)
ON DELETE NO CHECK
ON UPDATE
Which integrity constraint is violated in this relation definition?
Suggested Answer: C
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30 comments · newest first
TA
Talia
11 months ago
Domain constraint seems fine, so it must be referential!
CA
Catrice
11 months ago
I think it's more about entity integrity, not sure though.
DA
Dana
11 months ago
Wait, is there really a problem with the ON DELETE clause?
SE
Selene
12 months ago
Totally agree, it's about the foreign key!
CA
Carline
12 months ago
Looks like referential integrity is the issue here.
RO
Rochell
12 months ago
I thought entity integrity was about primary keys, so maybe that’s not the right answer. Could it be domain constraint instead?
EL
Elizabeth
1 year ago
I’m a bit confused about the ON DELETE NO CHECK part. Does that affect the integrity constraints? I can't recall if it relates to entity integrity.
KI
Kimbery
1 year ago
This question feels familiar; I practiced one about foreign keys last week. I believe the issue might be with the foreign key constraint.
LE
Leonida
1 year ago
I think I remember something about referential integrity being important for foreign keys, but I'm not entirely sure how it applies here.
JO
Jolanda
1 year ago
Confident I can get this one. The key is recognizing that the ON DELETE NO CHECK option on the foreign key violates referential integrity, since it allows deleting a student record without updating the corresponding housing record.
TI
Tiffiny
1 year ago
Okay, I think I've got this. The violation is in the referential integrity constraint, since the foreign key in HOUSING references STUDENT but has ON DELETE NO CHECK, which allows orphan records.
MA
Marge
1 year ago
Hmm, I'm a bit confused by the ON DELETE NO CHECK and ON UPDATE parts of the foreign key definition. I'll need to double-check my understanding of those options.
LA
Layla
1 year ago
This looks like a straightforward database integrity question. I'll carefully review the relation definitions and think through the different types of integrity constraints.
AM
Ammie
1 year ago
I'm with Cammy on this one. Enterprise constraint? Sounds like something straight out of a sci-fi novel. If I see that on the exam, I'm just going to start doodling spaceships in the margins.
AR
Arletta
1 year ago
So, it's not about spaceships then?
RO
Ronald
1 year ago
I think you're right. It's about maintaining consistency between related tables.
FI
Filiberto
1 year ago
No, it's not enterprise constraint. It's referential integrity.
CA
Cammy
1 year ago
Haha, you guys are overthinking this. The answer is clearly D) Enterprise constraint. I mean, who even knows what that is? The exam writers are just trying to trip us up!
RI
Rima
1 year ago
Haha, you guys are overthinking this. The answer is clearly D) Enterprise constraint. I mean, who even knows what that is? The exam writers are just trying to trip us up!
KR
Kris
1 year ago
C) Referential integrity
RO
Rosina
1 year ago
B) Domain constraint
DO
Domitila
1 year ago
A) Entity integrity
DE
Detra
1 year ago
Hold up, y'all. I bet the real answer is A) Entity integrity. I mean, the STUDENT relation has a primary key, but what if two students have the same name? Wouldn't that be a violation of entity integrity?
DO
Dorothea
1 year ago
I'm not so sure about that. The question says the relation definition has an issue, so I'm leaning towards B) Domain constraint. Maybe there's something funky with the data types or lengths of the attributes?
ST
Stephen
2 years ago
Hmm, this one's tricky. I think the answer is C) Referential integrity, since the HOUSING relation has a foreign key that references the STUDENT relation, but the ON DELETE constraint is set to NO CHECK, which could lead to dangling references.
AR
Arminda
1 year ago
Yes, having the ON DELETE set to NO CHECK can cause issues with maintaining the relationship between the two tables.
CO
Corrina
1 year ago
I agree, the referential integrity constraint is violated in this case.
CA
Carmelina
2 years ago
I believe the correct answer is C) Referential integrity because the foreign key reference is not properly set up.
LU
Lura
2 years ago
I agree with Catarina, the foreign key constraint is not properly defined.
CA
Catarina
2 years ago
I think the integrity constraint violated is referential integrity.