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Oracle 1Z1-071 시험은 SQL Select 문, 데이터 조작 언어 (DML) 및 데이터 정의 언어 (DDL) 명령, 테이블 작성 및 수정 및 데이터베이스 개체와 같은 다양한 주제에 대한 후보자를 테스트합니다. 시험에는 하위 쿼리, 조인 및 세트 연산자와 같은 고급 SQL 주제도 다룹니다. 시험 형식은 73 개의 객관식 질문으로 구성되며 응시자는 시험을 완료하는 데 105 분이 걸립니다.

최신 Oracle PL/SQL Developer Certified Associate 1z0-071 무료샘플문제 (Q143-Q148):

질문 # 143
Examine the description of the CUSTOMERS table:

Which three statements will do an implicit conversion?

A. SELECT * FROM customers WHERE customer_ id = 0001;
B. SELECT FROM customers WHERE insert date = '01-JAN-19';
C. SELECT * FROM customers WHERE TO_ CHAR (customer_ id) = '0001';
D. SELECT. FROM customers WHERE insert_ date = DATE *2019-01-01';
E. SELECT. FRON customers WE TO DATE (Insert _ date) = DATE '2019-01-01';
F. SELECT * FROM customers WHERE customer id = '0001';

정답：B,E,F

질문 # 144
The PRODUCT_INFORMATION table has a UNIT_PRICE column of data type NUMBER (8, 2).
Evaluate this SQL statement:
SELECT TO_CHAR(unit_price, `$9,999') FROM product_information;
Which two statements are true about the output? (Choose two.)

A. A row whose UNIT_PRICE column contains the value 10235.99 will be displayed as #######.
B. A row whose UNIT_PRICE column contains the value 10235.99 will be displayed as $1,0236.
C. A row whose UNIT_PRICE column contains the value 10235.99 will be displayed as $1,023.
D. A row whose UNIT_PRICE column contains the value 1023.99 will be displayed as $1,024.
E. A row whose UNIT_PRICE column contains the value 1023.99 will be displayed as $1,023.

정답：A,E

질문 # 145
Examine these statements:
CREATE TABLE alter_test (c1 VARCHAR2(10), c2 NUMBER(10));
INSERT INTO alter_test VALUES ('123', 123);
COMMIT;
Which is true ahout modifyIng the columns in AITER_TEST?

A. c1 can be changed to NUMBER(10) but c2 cannot be changed to VARCHAN2 (10).
B. c1 can be changed to VARCHAR2(5) and c2 can be changed to NUMBER (12,2).
C. c2 can be changed to NUMBER(5) but c1 cannot be changed to VARCHAN2 (5).
D. c1 can be changed to NUMBER(10) and c2 can be changed to VARCHAN2 (10).
E. c2 can be changed to VARCHAR2(10) but c1 cannot be changed to NUMBER (10).

정답：B

설명：
In Oracle SQL, the ALTER TABLE statement is used to modify the definition of a table after it has been created. Specific changes are allowed depending on the current data type of the column and the data it contains.
A . You cannot change a VARCHAR2 column to NUMBER if the table contains rows with non-numeric values, which is the case with '123' as a VARCHAR2; it is a string, not a number.
B . You can reduce the size of a NUMBER column if the data will still fit within the new precision, but you cannot change a VARCHAR2 column to a smaller size if it contains values that exceed the new size limit.
C . You cannot change a NUMBER column to VARCHAR2 if the table contains rows because the existing data type of NUMBER does not match the new data type of VARCHAR2.
D . Similar to A, you cannot change the data type from VARCHAR2 to NUMBER if non-numeric data is present.
E . You can change a VARCHAR2(10) column to VARCHAR2(5) if all existing rows have values that fit within the new size, and you can change a NUMBER column to have a different scale (NUMBER(12,2)).
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"

질문 # 146
Examine the structure of the MEMBERStable.

Which query can be used to display the last names and city names only for members from the states MO and MI?

A. SELECT DISTINCT last_name, city FROM members WHERE state ='MO' OR state
='MI';
B. SELECT last_name, city FROM members WHERE state IN ('MO', 'MI');
C. SELECT last_name, city FROM members WHERE state LIKE 'M%';
D. SELECT last_name, city FROM members WHERE state ='MO' AND state ='MI';

정답：B

질문 # 147
Which two statements are true about external tables?

A. Their metadata and actual data are both stoned outside the database.
B. Indexes can be created on them.
C. Their data can be retrieved by using only SQL or PL/SQL.
D. You can populate them from existing data in the database by using the CREATE TABLE AS SELECT command.
E. DML statements cannot be used on them.

정답：D,E

질문 # 148
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