Oracle 1z0-071최고품질덤프데모다운로드, 1z0-071최고덤프

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최신 Oracle PL/SQL Developer Certified Associate 1z0-071 무료샘플문제 (Q18-Q23):

질문 # 18
View the Exhibit and examine the structure of ORDERS and CUSTOMERS tables. (Choose the best answer.)

You executed this UPDATE statement:

Which statement is true regarding the execution?

A. It would not execute because a subquery cannot be used in the WHERE clause of an UPDATE statement.
B. It would not execute because two tables cannot be referenced in a single UPDATE statement.
C. It would not execute because a SELECT statement cannot be used in place of a table name.
D. It would execute and restrict modifications to the columns specified in the SELECT statement.

정답：D

질문 # 19
Examine the SQL statement used to create the TRANSACTION table. (Choose the best answer.) SQL > CREATE TABLE transaction (trn_id char(2) primary key,
Start_date date DEFAULT SYSDATE,
End_date date NOT NULL);
The value 'A1' does not exist for trn_id in this table.
Which SQL statement successfully inserts a row into the table with the default value for START_DATE?

A. INSERT INTO transaction VALUES ('A1', DEFAULT, TO_DATE(DEFAULT+10))
B. INSERT INTO transaction VALUES ('A1', DEFAULT, TO_DATE('SYSDATE+10'))
C. INSERT INTO transaction (trn_id, start_date, end_date) VALUES ('A1', , '10-DEC-2014')
D. INSERT INTO transaction (trn_id, end_date) VALUES ('A1', '10-DEC-2014')

정답：D

질문 # 20
Which statement executes successfully?

A. SELECT TO_NUWBER(TO_DATE(INTERVAL '800' SECOND)) FROM DUAL;
B. SELECT TO_DATE(TO_NUMBER(INTERVATL '800' SECOND)) FROM DUAL;
C. SELECT TO_NUMBER(INTERVAL'800' SECOND, 'HH24:MM') FROM DUAL;
D. SELECT TO_CHAR(INTERVAL '800' SECOND, 'HH24:MM') FROM DUAL;
E. SELECT TO_DATE(INTERVAL '800' SECOND,'HH24:MM') FROM DUAL;

정답：D

설명：
Oracle's interval data types store a period of time. When you want to format an interval as a string, you can use the TO_CHAR function.
A . This statement will not execute successfully because TO_DATE expects a string representing a date, not a number derived from an interval.
B . This statement will not execute successfully because TO_NUMBER does not support interval data types as an input.
C . This statement will not execute successfully because TO_DATE does not support interval data types as an input.
D . This statement will not execute successfully because TO_NUMBER expects a number or a string representing a number as an argument, not a date.
E . This statement will execute successfully. TO_CHAR function can be used to convert interval values to a formatted string, such as 'HH24:MM'.
Reference:
Oracle Documentation on Datetime Functions: https://docs.oracle.com/database/121/SQLRF/functions092.htm#SQLRF00654

질문 # 21
Which two statements are true about a full outer join?

A. It returns matched and unmatched rows from both tables being joined.
B. The Oracle join operator (+) must be used on both sides of the join condition in the WHERE clause.
C. It includes rows that are returned by a Cartesian product.
D. It returns only unmatched rows from both tables being joined.
E. It includes rows that are returned by an inner join.

정답：A,E

설명：
In Oracle Database 12c, regarding a full outer join:
* A. It includes rows that are returned by an inner join. This is true. A full outer join includes all rows from both joined tables, matching wherever possible. When there's a match in both tables (as with an inner join), these rows are included.
* D. It returns matched and unmatched rows from both tables being joined. This is correct and the essence of a full outer join. It combines the results of both left and right outer joins, showing all rows from both tables with matching rows from the opposite table where available.
Options B, C, and E are incorrect:
* B is incorrect because the Oracle join operator (+) is used for syntax in older versions and cannot implement a full outer join by using (+) on both sides. Proper syntax uses the FULL OUTER JOIN keyword.
* C is incorrect as a Cartesian product is the result of a cross join, not a full outer join.
* E is incorrect because it only describes the scenario of a full anti-join, not a full outer join.

질문 # 22
Which three items does a direction of a relationship contain?

A. an attribute
B. label
C. a unique identifier
D. an entity
E. an optionality
F. a cardinality

정답：A,D,F

질문 # 23
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