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1Z0-051 Oracle Database: SQL Fundamentals I 日本国内における最も信頼できるIT試験専門家として、最新の品質の高いIT試験の学習資料を提供し、お客様のために試験に順調に合格することを助けます.最高品質問題集/試験問題集100パーセント品質保証.問題集は弊社の数名のIT専門家より心をこめて編集して整理されたもので、正確率が99%以上に達します.

参考書 1Z0-051 Oracle 資格認定

QUESTION 1
View the Exhibit and examine the data in the

The PROJ_TASK_DETAILS table stores information about tasks involved in a project and the relation between them.
The BASED_ON column indicates dependencies between tasks. Some tasks do not depend on the completion of any other tasks.

You need to generate a report showing all task IDs, the corresponding task ID they are dependent on, and the name of the employee in charge of the task it depends on.

Which query would give the required result?

A. SELECT p.task_id, p.based_on, d.task_in_charge
FROM proj_task_details p JOIN proj_task_details d
ON (p.based_on = d.task_id);
B. SELECT p.task_id, p.based_on, d.task_in_charge
FROM proj_task_details p LEFT OUTER JOIN proj_task_details d ON (p.based_on = d.task_id);
C. SELECT p.task_id, p.based_on, d.task_in_charge
FROM proj_task_details p FULL OUTER JOIN proj_task_details d ON (p.based_on = d.task_id);
D. SELECT p.task_id, p.based_on, d.task_in_charge
FROM proj_task_details p JOIN proj_task_details d
ON (p.task_id = d.task_id);

Answer: B

QUESTION 2
Which two statements are true regarding subqueries? (Choose two.)

A. A subquery can retrieve zero or more rows.
B. Only two subqueries can be placed at one level.
C. A subquery can be used only in SQL query statements.
D. A subquery can appear on either side of a comparison operator.
E. There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement.

Answer: AD

参考書 1Z0-051 Oracle 資格認定