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CIW 1D0-541 Exam - Topic 2 Question 98 Discussion

Consider the Information Engineering diagram shown in the exhibit for a buildingmanagement company. Referential integrity must be maintained such that a building cannot bedeleted when it has residents. Building_ID, R_ID, Room_Count and Room_Num are integernumbers, whereas Bldg_Name, Location and Res_Name are all represented by variable-lengthstrings with a maximum of 20 characters. Which SQL statement best implements the relationsshown in this diagram?
D) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECK ON UPDATE CASCADE);
A) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES RESIDENT (Building_ID) ON DELETE NO CHECK);
B) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECK ON UPDATE CASCADE);
C) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECK ON UPDATE CASCADE);

CIW 1D0-541 Exam - Topic 2 Question 98 Discussion

Actual exam question for CIW's 1D0-541 exam
Question #: 98
Topic #: 2
[All 1D0-541 Questions]

Consider the Information Engineering diagram shown in the exhibit for a building

management company. Referential integrity must be maintained such that a building cannot be

deleted when it has residents. Building_ID, R_ID, Room_Count and Room_Num are integer

numbers, whereas Bldg_Name, Location and Res_Name are all represented by variable-length

strings with a maximum of 20 characters. Which SQL statement best implements the relations

shown in this diagram?

Show Suggested Answer Hide Answer
Suggested Answer: D

by Jerry at Sep 16, 2024, 07:12 AM

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Melita
8 months ago
Isn't it weird that you can delete a building with residents?
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Shakira
8 months ago
Totally agree with B, it maintains referential integrity well!
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Lillian
8 months ago
Wait, why is there "NO CHECK" in the foreign key? That seems off.
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Rusty
8 months ago
I think C is better because it has ON UPDATE CASCADE.
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Ronny
9 months ago
Option B looks solid with the foreign key reference.
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Desiree
9 months ago
I thought option C looked good, but I’m confused about the ON UPDATE CASCADE part. Does that really apply here?
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Vinnie
9 months ago
I practiced a similar question, and I feel like the ON DELETE NO CHECK part might be wrong in all options. Shouldn't it be ON DELETE RESTRICT instead?
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Leatha
9 months ago
I'm not entirely sure, but I remember something about referential integrity needing to prevent deletions when there are related records.
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Vincent
9 months ago
I think option B is the right choice because it correctly references the BUILDING table for the foreign key.
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Justine
9 months ago
This is a good test of my SQL knowledge. I'll review each option carefully and select the one that best implements the relations shown in the diagram.
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Alayna
9 months ago
Okay, I think I've got this. The key is to properly define the foreign key relationship between the RESIDENT and BUILDING tables to maintain referential integrity.
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Soledad
9 months ago
Hmm, I'm a bit confused by the referential integrity constraint. I need to make sure I understand how that affects the foreign key relationship between the tables.
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Doug
9 months ago
This looks like a straightforward database design question. I'll carefully read through the requirements and the diagram to determine the correct SQL statement.
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Cristy
10 months ago
I'm feeling confident about this one. The question provides clear instructions, and the diagram makes the database structure pretty straightforward.
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Kati
10 months ago
This one seems pretty straightforward. I'm pretty confident that the answer is Robert Koch, since he was known for his work identifying the anthrax bacteria.
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Lachelle
1 year ago
Hmm, this question is making me thirsty. I wonder if there's a building management company that also owns a pub. That would be a great side gig!
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Sarah
1 year ago
Hmm, a building management company owning a pub would be a cool idea!
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Julio
1 year ago
C) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECK ON UPDATE CASCADE);
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Ira
1 year ago
B) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID) ON DELETE NO CHECK ON UPDATE CASCADE);
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Karl
1 year ago
A) CREATE TABLE BUILDING ( Building_ID INTEGER NOT NULL PRIMARY KEY, Bldg_Name VARCHAR (20), Location VARCHAR (20), Room_Count INTEGER ); CREATE TABLE RESIDENT ( R_ID NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES RESIDENT (Building_ID) ON DELETE NO CHECK);
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Whitley
1 year ago
I'm going with option D. It's the most concise and clear implementation of the relations shown in the diagram. As a bonus, the ON UPDATE CASCADE clause means I don't have to worry about manually updating references when a building's ID changes. Score one for the lazy programmer!
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Jeannine
1 year ago
This is a tricky one. I'm leaning towards option C since it's the same as option D, but with a more descriptive comment. The ON DELETE NO CHECK and ON UPDATE CASCADE clauses are important to maintain referential integrity.
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Ronny
1 year ago
I'm not sure, but I think option C is the safest bet to maintain referential integrity.
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Ronny
1 year ago
I think option D is also a good choice because it includes the necessary clauses for referential integrity.
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Ronny
1 year ago
I agree, option C seems like the best choice with the additional comment for clarity.
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Yasuko
1 year ago
I'm not sure about the ON DELETE NO CHECK clause. Shouldn't it be ON DELETE RESTRICT to prevent deleting a building with residents?
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Audra
1 year ago
That's a good point, ON DELETE CASCADE would ensure that the related residents are also deleted when a building is deleted.
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Audra
1 year ago
But wouldn't ON DELETE CASCADE be more appropriate to automatically delete the related residents when a building is deleted?
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Audra
1 year ago
I think you're right, ON DELETE RESTRICT would be a better option to prevent deleting a building with residents.
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Olene
1 year ago
I think option D is the correct answer. The foreign key constraint on the Building_ID column in the RESIDENT table references the BUILDING table, ensuring referential integrity. The ON DELETE NO CHECK clause prevents deleting a building that has residents, and the ON UPDATE CASCADE clause ensures that changes to the Building_ID in the BUILDING table are propagated to the RESIDENT table.
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Cassi
1 year ago
User 2
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Aliza
1 year ago
User 1
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Mirta
1 year ago
Why do you think option C is better?
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Janet
1 year ago
I disagree, I believe option C is the best choice.
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Mirta
1 year ago
I think the correct answer is option B.
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