Oracle 1z1-071인증시험 - 1z1-071최신인증시험정보

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Oracle 1z0-071 자격증 시험은 데이터베이스 관리, 데이터베이스 개발 또는 데이터 분석 직업을 추구하려는 개인들에게 적합합니다. 이 시험은 Oracle 데이터베이스와 함께 작업하는 전문가들, 개발자, 데이터베이스 관리자, 시스템 분석가 및 기술 컨설턴트를 위한 필수 조건입니다. Oracle 1z0-071 자격증 시험을 통과함으로써 후보자는 SQL 프로그래밍 능력과 Oracle 데이터베이스 작업 능력을 입증하여 직업 전망과 수익 가능성을 높일 수 있습니다.

1Z1-071 시험은 SQL 기본, 데이터 조작, 데이터 검색, 테이블 작성 등 다양한 주제를 다룹니다. 시험은 어려우며 SQL 언어에 대한 깊은 이해가 필요합니다. 이 인증 시험을 통과하면 Oracle Database SQL과 효과적으로 작업하는 데 필요한 기술과 지식이 있음을 보여줍니다.

>> Oracle 1z1-071인증시험 <<

최신 Oracle PL/SQL Developer Certified Associate 1z1-071 무료샘플문제 (Q184-Q189):

질문 # 184
Which statement adds a column called SALARYto the EMPLOYEEStable having 100 rows, which cannot contain null?
ALTER TABLE EMPLOYEES

A. ADD SALARY NUMBER(8,2) DEFAULT 0 NOT NULL;
ALTER TABLE EMPLOYEES
B. ADD SALARY NUMBER(8,2) DEFAULT CONSTRAINT p_nn NOT NULL;
ALTER TABLE EMPLOYEES
C. ADD SALARY NUMBER(8,2) DEFAULT NOT NULL;
ALTER TABLE EMPLOYEES
D. ADD SALARY NUMBER(8,2) NOT NULL;

정답：C

질문 # 185
Examine the data in the CUSTOMERS table:
You want to list all cities that have more than one customer along with the customer details.
Evaluate the following query:
Which two JOIN options can be used in the blank in the above query to give the correct output? (Choose two.)

A. FULL OUTER JOIN
B. RIGHT OUTER JOIN
C. JOIN
D. NATURAL JOIN
E. LEFT OUTER JOIN

정답：B,C

질문 # 186
Which two are true about a SQL statement using SET operators such as UNION?

A. The number, but not names, of columns must be identical for all SELECT statements in the query.
B. The data type of each column returned by the second query must exactly match the data type of the corresponding column returned by the first query.
C. The data type of each column returned by the second query must be implicitly convertible to the data type of the corresponding column returned by the first query.
D. The names and number of columns must be identical for all SELECT statements in the query.
E. The data type group of each column returned by the second query must match the data type group of the corresponding column returned by the first query.

정답：A,B

질문 # 187
Examine the description of the PRODUCT_ DETAILS table:

Which two statements are true?

A. EXPIRY_ DATE cannot be used in arithmetic expressions.
B. PRODUCT_ PRICE contains the value zero by default if no value is assigned to it.
C. PRODUCT_ NAME cannot contain duplicate values.
D. PRODUCT_ ID can be assigned the PRIMARY KEY constraint.
E. EXPIRY_ DATE contains the SYSDATE by default if no date is assigned to it.
F. PRODUCT_ PRICE can be used in an arithmetic expression even if it has no value stored in it.

정답：A,D

설명：
In reference to the attributes of the PRODUCT_DETAILS table:
A). This statement is false. If PRODUCT_PRICE has no value (i.e., it is NULL), it cannot be used directly in arithmetic expressions because any operation with NULL results in NULL.
B). This statement is true. PRODUCT_ID has the NOT NULL constraint and is of type NUMBER, making it eligible to be a PRIMARY KEY. Primary keys require all values to be unique and not null.
C). This statement is true. EXPIRY_DATE is of type DATE, and it cannot be used in arithmetic expressions directly without a date function that operates on dates.
D). This statement is false. By default, columns of type DATE do not have a default value unless explicitly assigned using the DEFAULT keyword in the column definition.
E). This statement is false. By default, numeric columns do not have a default value unless specified with the DEFAULT keyword.
F). This statement is false. The statement about PRODUCT_NAME not containing duplicate values would be true if it were a UNIQUE or PRIMARY KEY, but there is no such constraint indicated in the provided table description.

질문 # 188
Which two are true about unused columns?

A. The DESCRIBE command displays unused columns
B. A primary key column cannot be set to unused.
C. A query can return data from unused columns, but no DML is possible on those columns.
D. Unused columns retain their data until they are dropped
E. Once a column has been set to unused, a new column with the same name can be added to the table.
F. A foreign key column cannot be set to unused.

정답：D,E

설명：
Unused columns are a feature in Oracle that allows a column to be marked as unused without immediately dropping it from the table structure. The key points for each option are:
A: The DESCRIBE command does not display unused columns. These columns are also not visible in user_tab_cols but are visible in user_unused_col_tabs.
B: Primary key columns can be set to unused, but you must drop the primary key constraint before doing so.
C: Once a column is marked as unused, it is not possible to query it, and Oracle will not allow DML operations on that column.
D: This is true. Once a column is set to unused, you can add a new column with the same name because Oracle essentially considers the unused column as removed from the table.
E: Just like primary key columns, a foreign key column can be marked as unused, but you must drop the foreign key constraint first.
F: This is true. Unused columns retain their data until the column is dropped using the DROP UNUSED COLUMNS command.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"
* Oracle Database Administrator's Guide, 12c Release 1 (12.1)

질문 # 189
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Oracle 1z1-071인증시험 - 1z1-071최신인증시험정보

최신 1z1-071인증시험 덤프문제

최신 Oracle PL/SQL Developer Certified Associate 1z1-071 무료샘플문제 (Q184-Q189):