Oracle 1z1-071日本語版試験勉強法 & 1z1-071最新知識

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Oracle 1z0-071（Oracle Database SQL）試験は、SQLプログラミング言語とOracleデータベースの専門知識を証明したいITプロフェッショナルを対象としています。この試験は、Oracle Certified Associate（OCA）認定プログラムの一部であり、Oracle認定プロフェッショナルになりたいプロフェッショナルにとって重要な要件です。この試験では、SQLステートメント、データ操作、データベースオブジェクト、データ制御言語など、幅広いトピックが扱われます。

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1z1-071最新知識、1z1-071認証試験

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Oracle Database SQL 認定 1z1-071 試験問題 (Q10-Q15):

質問 # 10
Which three statements are true about the DESCRIBE command?

A. It displays the PRIMARY KEY constraint for any column or columns that have that constraint.
B. It can be used only from SQL*Plus.
C. It can be used from SQL Developer.
D. It displays all constraints that are defined for each column.
E. It displays the NOT NULL constraint for any columns that have that constraint.
F. It can be used to display the structure of an existing view.

正解：C、E、F

解説：
A: True. The DESCRIBE command can indeed be used from SQL Developer as well as other Oracle database tools such as SQL*Plus. This command is used to display the structure of a table, view, or other object, showing information such as column names, data types, and whether a column is nullable.
B: True. The DESCRIBE command can be used to display the structure of an existing view, showing similar information as it would for a table. This includes the columns, their data types, and other pertinent details.
D: True. When DESCRIBE is used, it does display the NOT NULL constraints for columns that have this constraint. This is part of the basic information about the structure of a table or view that can help developers understand the requirements of the data stored therein.

質問 # 11
Which two are true about the data dictionary?

A. All user actions are recorded in the data dictionary.
B. Base tables in the data dictionary have the prefix DBA_.
C. All users have permissions to access all information in the data dictionary by default
D. The SYS user owns all base tables and user-accessible views in the data dictionary.
E. The data dictionary is constantly updated to reflect changes to database objects, permissions, and data.

正解：D、E

解説：
C . True, the data dictionary is constantly updated to reflect changes to the metadata of the database objects, permissions, and structures, among other things.
E . True, the SYS user owns all base tables in the data dictionary. These base tables underlie all data dictionary views that are accessible by the users.
A, B, and D are not correct because: A. Base tables do not necessarily have the prefix DBA_; instead, DBA_ is a prefix for administrative views that are accessible to users with DBA privileges. B. The data dictionary records metadata about the actions, not the actions themselves. D. Not all users have access to all information in the data dictionary. Access is controlled by privileges.
Reference:
Oracle documentation on data dictionary and dynamic performance views: Oracle Database Reference Understanding the Oracle data dictionary: Oracle Database Concepts

質問 # 12
Examine the description of the EMPLOYEES table

You write this failing statement:
SELECT dept_no AS department_id, MAX (salary) As max_sal
FROM employees
WHERE salary >10000
GROUP BY department_id
ORDER BY max_sal;
Which clause causes the error?

A. GROUP BY
B. ORDER BY
C. SELECT
D. WHERE

正解：A

解説：
In the SQL statement provided, the error is caused by the GROUP BY clause. In Oracle SQL, when using GROUP BY, the expression in the GROUP BY clause must match exactly the expression in the SELECT list. The GROUP BY clause should reference the column name dept_no as mentioned in the SELECT list, not the alias department_id which is defined within the same SELECT statement.
The corrected SQL statement should be:
SELECT dept_no AS department_id, MAX(salary) As max_sal FROM employees WHERE salary > 10000 GROUP BY dept_no -- Changed from 'department_id' to 'dept_no' ORDER BY max_sal; References:
* Oracle Documentation on GROUP BY clause: GROUP BY Clause

質問 # 13
Which statement is true regarding external tables?

A. ORACLE_LOADERand ORACLE_DATAPUMPhave exactly the same functionality when used with an external table.
B. The data and metadata for an external table are stored outside the database.
C. The default REJECT LIMITfor external tables is UNLIMITED.
D. The CREATE TABLE AS SELECTstatement can be used to upload data into a normal table in the database from an external table.

正解：D

解説：
Explanation/Reference:
References:
https://docs.oracle.com/cd/B28359_01/server.111/b28310/tables013.htm

質問 # 14
A session's NLS_DATE_FORMAT is set to DD Mon YYYY .
Which two queries return the value 1 Jan 2019?

A. SELECT TO_ DATE('2019-01-01') FROM DUAL;
B. SELECT TO_CHAR('2019-01-01') FROM DUAL; 2019-01-01
C. SELECT '2019-01-01' FROM DUAL ; 2019-01-01
D. SELECT DATE '2019-01-01' FROM DUAL ;
E. SELECT to_date(' 2019-01-01 ', 'YYYY -MM-DD' ) FROM DUAL;

正解：D、E

質問 # 15
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