Oracle 1z0-071基礎問題集: Oracle Database SQL - Tech4Exam認定トレーニングを提供する権威の会社

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Oracle 1z0-071 Exam Syllabus Topics:

Section	Weight	Objectives
Using DDL Statements to Create and Manage Tables	14%	- Create a simple table - Categorize the main database objects - Drop, rename, and truncate tables - Alter table definitions - Review the table structure - Describe the data types that are available for columns
Using Single-Row Functions to Customize Output	10%	- Manipulate numbers with the ROUND, TRUNC, and MOD functions - Perform arithmetic with date data - Manipulate dates with the date functions - Describe the differences between single-row and multiple-row functions - Manipulate strings with character function in the SELECT and WHERE clauses
Controlling User Access	5%	- Distinguish between granting privileges and roles - Grant privileges on tables and on a view - Differentiate system privileges from object privileges
Manipulating Data	14%	- Describe each data manipulation language (DML) statement - Control transactions - Insert rows into a table - Delete rows from a table - Update rows in a table
Restricting and Sorting Data	6%	- Limit the rows that are retrieved by a query - Sort the rows that are retrieved by a query - Use DEFINE and UNDEFINE commands - Use ampersand substitution to restrict and sort output at runtime
Using Conversion Functions and Conditional Expressions	10%	- Describe implicit and explicit data type conversion - Use conditional IF THEN ELSE logic in a SELECT statement - Apply the NVL, NULLIF, and COALESCE functions to data - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions
Using Set Operators	5%	- Use a set operator to combine multiple queries into a single query - Describe the order of precedence when the set operators are used - Describe set operators
Retrieving Data Using the SQL SELECT Statement	5%	- List the capabilities of SQL SELECT statements - Execute a basic SELECT statement - Differentiate between SQL statements and SQL*Plus commands
Using Subqueries to Solve Queries	15%	- List the types of subqueries - Define subqueries - Describe the types of problems that subqueries can solve - Write single-row and multi-row subqueries
Reporting Aggregated Data Using Group Functions	15%	- Identify the available group functions - Group data by using the GROUP BY clause - Describe the use of group functions - Include or exclude grouped rows by using the HAVING clause
Creating Other Schema Objects	10%	- Create and maintain indexes - Create, modify, and retrieve data from a view - Create synonyms for database objects - Create, maintain, and use sequences
Displaying Data from Multiple Tables Using Joins	15%	- View data that does not meet a join condition by using outer joins - Join a table to itself by using a self-join - Cross join tables - Write SELECT statements to access data from more than one table using equijoins and non-equijoins
Working with Oracle Database SQL	8%	- Explain the installation of Oracle Database software - Start up and shut down a database - Describe the Oracle Database architecture - Create a container database

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Oracle Database SQL 認定 1z0-071 試験問題 (Q34-Q39):

質問 # 34
Which statements are true regarding primary and foreign key constraints and the effect they can have on table data?

A. A table can have only one primary key and one foreign key.
B. It is possible for child rows that have a foreign key to remain in the child table at the time the parent row is deleted.
C. A table can have only one primary key but multiple foreign keys.
D. Primary key and foreign key constraints can be defined at both the column and table level.
E. Only the primary key can be defined the column and table level.
F. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted.
G. The foreign key columns and parent table primary key columns must have the same names.

正解：C、D、F

解説：
Regarding primary and foreign key constraints:
* A. A table can have only one primary key but multiple foreign keys. This is true. A table is constrained to have only one primary key, which can consist of multiple columns, but can have several foreign keys referencing primary keys in other tables.
* C. Primary key and foreign key constraints can be defined at both the column and table level.
True. Constraints can be defined inline with the column definition or separately at the end of the table definition.
* E. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted. This is also true if the foreign key is defined with the ON DELETE CASCADE option.
Options B, D, F, and G are incorrect:
* B is incorrect because if a parent row is deleted, the child rows cannot remain without violating the integrity unless the foreign key is defined with ON DELETE SET NULL or similar behavior.
* D is incorrect because both primary and foreign key constraints can be defined at both levels.
* F is incorrect as the names of the foreign key columns do not need to match the primary key column names.
* G is incorrect as a table can have multiple foreign keys.

質問 # 35
Examine the structure of the EMPLOYEES table.

You must display the maximum and minimum salaries of employees hired 1 year ago.
Which two statements would provide the correct output? (Choose two.)

A. SELECT MIN(Salary) minsal, MAX(salary) maxsal
FROM employees
WHERE hire_date < SYSDATE-365
GROUP BY MIN(salary), MAX(salary);
B. SELECT minsal, maxsal
FROM (SELECT MIN(salary) minsal, MAX(salary) maxsal
FROM employees
WHERE hire_date < SYSDATE-365)
GROUP BY maxsal, minsal;
C. SELECT MIN(Salary), MAX(salary)
FROM (SELECT salary FROM
employees
WHERE hire_date < SYSDATE-365);
D. SELECT minsal, maxsal
FROM (SELECT MIN(salary) minsal, MAX(salary) maxsal
FROM employees
WHERE hire_date < SYSDATE-365
GROUP BY MIN(salary), MAX(salary));

正解：B、C

質問 # 36
You execute this command:

Which two are true? (Choose two.)

A. A FLASHBACK TABLE statement can be used to retrieve the deleted data.
B. It retains the indexes defined on the table.
C. It drops any triggers defined on the table.
D. It always retains the space used by the removed rows.
E. A ROLLBACK statement can be used to retrieve the deleted data.
F. It retains the integrity constraints defined on the table.

正解：B、F

解説：
https://docs.oracle.com/html/E25494_01/general003.htm

質問 # 37
Examine the structure of the BOOKS_TRANSACTIONS table:

You want to display the member IDs, due date, and late fee as $2 for all transactions.
Which SQL statement must you execute?

A. SELECT member_id AS "MEMBER ID", due_date AS "DUE DATE", '$2' AS "LATE FEE" FROM BOOKS_TRANSACTIONS;
B. SELECT member_id AS MEMBER_ID, due_date AS DUE_DATE, $2 AS LATE_FEE
FROM BOOKS_TRANSACTIONS;
C. SELECT member_id AS "MEMBER ID", due_date AS "DUE DATE", $2 AS "LATE FEE" FROM BOOKS_TRANSACTIONS;
D. SELECT member_id 'MEMBER ID', due_date 'DUE DATE', '$2 AS LATE FEE' FROM BOOKS_TRANSACTIONS;

正解：A

質問 # 38
Which two tasks can be performed by using Oracle SQL statements?

A. starting up a database instance
B. connecting to a database instance
C. executing operating system (OS) commands in a session
D. changing the password for an existing database
E. querying data from tables across databases

正解：D、E

解説：
http://www.techonthenet.com/oracle/password.php
https://docs.oracle.com/cd/B28359_01/server.111/b28324/tdpii_distdbs.htm

質問 # 39
......

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