Download Oracle Datbase 12c SQL.1z0-071.PracticeTest.2019-06-19.131q.tqb

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Demo Questions

View the exhibit and examine the structures of the EMPLOYEES and DEPARTMENTS tables.

You want to update EMPLOYEES table as follows:

Update only those employees who work in Boston or Seattle (locations 2900 and 2700).
Set department_id for these employees to the department_id corresponding to London (location_id 2100).
Set the employees' salary in location_id 2100 to 1.1 times the average salary of their department.
Set the employees' commission in location_id 2100 to 1.5 times the average commission of their department.

You issue the following command:

What is outcome?

It generates an error because multiple columns (SALARY, COMMISSION) cannot be specified together in an UPDATE statement.
It generates an error because a subquery cannot have a join condition in a UPDATE statement.
It executes successfully and gives the desired update
It executes successfully but does not give the desired update

Correct answer: D

Explanation:

Evaluate the following two queries:

Which statement is true regarding the above two queries?

Performance would improve in query 2 only if there are null values in the CUST_CREDIT_LIMIT column.
There would be no change in performance.
Performance would degrade in query 2.
Performance would improve in query 2.

Correct answer: B

Examine the business rule:

Each student can work on multiple projects and each project can have multiple students.

You need to design an Entity Relationship Model (ERD) for optimal data storage and allow for generating reports in this format:

STUDENT_ID FIRST_NAME LAST_NAME PROJECT_ID PROJECT_NAME PROJECT_TASK

Which two statements are true in this scenario? (Choose two.)

The ERD must have a 1:M relationship between the STUDENTS and PROJECTS entities.
The ERD must have a M:M relationship between the STUDENTS and PROJECTS entities that must be resolved into 1:M relationships.
STUDENT_ID must be the primary key in the STUDENTS entity and foreign key in the PROJECTS entity.
PROJECT_ID must be the primary key in the PROJECTS entity and foreign key in the STUDENTS entity.
An associative table must be created with a composite key of STUDENT_ID and PROJECT_ID, which is the foreign key linked to the STUDENTS and PROJECTS entities.

Correct answer: BE

Explanation:

References:http://www.oracle.com/technetwork/issue-archive/2011/11-nov/o61sql-512018.html

References:

http://www.oracle.com/technetwork/issue-archive/2011/11-nov/o61sql-512018.html

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