CIW 1D0-541 Exam Questions

Question 6 of 31

Consider the Dept1_Parts and Dept2_Parts relations shown in the exhibit. Which of the following SQL statements would create a set difference of the two relations with the widest variety of Structured Query Language dialects?

A.

SELECT * FROM Dept1_Parts EXCEPT(SELECT PartJD FROM Dept2_Parts);

B.

SELECT * FROM Dept1_Parts MINUS (SELECT Part_ID FROM Dept2_Parts);

C.

SELECT * FROM Dept1_Parts DIFFERENCE (SELECT Part_ID FROM Dept2_Parts);

D.

SELECT * FROM Dept1_Parts WHERE Part_ID NOT IN (SELECT Part_ID FROM Dept2_Parts);

Correct Answer: D

The SQL statement that would create a set difference of the two relations with the widest variety of Structured Query Language dialects is: SELECT * FROM Dept1_Parts WHERE Part_ID NOT IN (SELECT Part_ID FROM Dept2_Parts). This statement uses the NOT IN clause, which is widely supported across different SQL dialects, to filter out rows from Dept1_Parts where the Part_ID exists in Dept2_Parts.

Question 7 of 31

Consider the Information Engineering diagram shown in the exhibit. 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 RESIDENT relation shown in this diagram?

A.

CREATE TABLE RESIDENT ( R_ID INTEGER NULL PRIMARY KEY, Room_Num FLOAT, Res_Name VARCHAR, Building_ID INTEGER NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID));

B.

CREATE TABLE RESIDENT ( R_ID INTEGER NOT NULL PRIMARY KEY, Room_Num BINARY, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID));

C.

CREATE TABLE RESIDENT ( R_ID INTEGER NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL);

D.

CREATE TABLE RESIDENT ( R_ID INTEGER NOT NULL PRIMARY KEY, Room_Num INTEGER, Res_Name VARCHAR (20), Building_ID INTEGER NOT NULL, FOREIGN KEY Building_ID REFERENCES BUILDING (Building_ID));

Correct Answer: D

The correct SQL statement should ensure that 'R_ID' is not null and is set as the primary key, 'Room_Num' is an integer, 'Res_Name' is a variable-length string with a maximum of 20 characters, and 'Building_ID' is not null with a foreign key constraint referencing 'Building_ID' in the BUILDING table. Option D meets all these requirements.

Question 8 of 31

Which term describes one or more database operations that are executed as a single unit?

A.

Update

B.

Transaction

C.

Encapsulation

D.

Operational group

Correct Answer: B

A transaction describes one or more database operations that are executed as a single unit. Transactions ensure that either all operations within the unit are completed successfully or none are, maintaining the integrity of the database.

Question 9 of 31

Consider the following relations shown in the exhibit. Which of the following SQL statements would return the Customers2 relation from the Customers relation?

A.

SELECT * FROM Customers WHERE Satisfaction_Rate <= 80 OR Satisfaction_Rate >= 90;

B.

SELECT * FROM Customers WHERE Satisfaction_Rate IN (80 AND 90);

C.

SELECT *FROM Customers WHERE Satisfaction_Rate >= 80 AND Satisfaction_Rate <= 89;

D.

SELECT * FROM Customers WHERE Satisfaction_Rate BETWEEN (80, 90);

Correct Answer: C

The correct SQL statement to return the Customers2 relation from the Customers relation is: SELECT * FROM Customers WHERE Satisfaction_Rate >= 80 AND Satisfaction_Rate <= 89. The Customers2 relation includes records where the Satisfaction_Rate is between 80 and 89 inclusive (85 and 81 in this case). The options that involve satisfaction rates of exactly 80 or 90, or using the BETWEEN syntax without proper boundaries, are incorrect.

Question 10 of 31

Which of the following best describes the ON DELETE NO ACTION referential integrity constraint?

A.

If a parent key is deleted, any child keys referenced by the parent key are automatically deleted.

B.

If a parent key is deleted, no test is made for referential integrity.

C.

If any child key references a parent key, the record containing the parent key cannot be deleted.

D.

If a parent key is deleted, all child keys are automatically set to a specified value. C

Correct Answer:

The ON DELETE NO ACTION referential integrity constraint ensures that if a parent key is being referenced by any child keys in a database, the record containing the parent key cannot be deleted. This constraint helps maintain data integrity by preventing the deletion of a parent record if there are still dependent child records linked to it.