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最新Oracle 1z1-071題庫資源 &新版1z1-071題庫

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最新的最新1z1-071題庫資源和資格考試中的領先提供商和無與倫比的1z1-071：Oracle Database SQL

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最新的 Oracle PL/SQL Developer Certified Associate 1z1-071 免費考試真題 (Q75-Q80):

問題 #75
Which three are true about the MERGEstatement?

A. It can use views to produce source rows.
B. It can update the same row of the target table multiple times.
C. It can merge rows only from tables.
D. It can update, insert, or delete rows conditionally in multiple tables.
E. It can combine rows from multiple tables conditionally to insert into a single table.
F. It can use subqueries to produce source rows.

答案：A,D,F

解題說明：
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-merge/

問題 #76
Examine the description of the BOOKS_TRANSACTIONS table:

Examine this partial SQL statement:
SELECT * FROM books_transactions
Which two WHERE conditions give the same result?

A. WHERE borrowed_date = SYSDATE AND transaction_type = 'RM' AND (member_id = 'A101' OR member_id = 'A102'));
B. WHERE borrowed_date = SYSDATE AND transaction_type = 'RM' AND member_id = 'A101' OR member_id = 'A102');
C. WHERE borrowed_date = SYSDATE AND transaction_type = 'RM' OR member_id IN('A101','A102');
D. WHERE (borrowed_date = SYSDATE AND transaction_type = 'RM') OR member_id IN ('A101','A102');
E. WHERE borrowed_date = SYSDATE AND transaction_type = 'RM' OR member_id IN('A101','A102');

答案：A,D

解題說明：
When writing SQL statements with multiple conditions in the WHERE clause, it's important to understand how logical operators like AND and OR work. These operators are used to filter records based on more than one condition:
* The AND operator displays a record if all the conditions separated by AND are TRUE.
* The OR operator displays a record if any of the conditions separated by OR is TRUE.
The precedence of these operators is also important: AND operations are always evaluated before OR operations unless parentheses are used to explicitly define the order of operations. Therefore, conditions enclosed in parentheses are evaluated first as per the standard SQL operator precedence.
Given this understanding, let's evaluate the options:
* Option A uses parentheses to group the borrowed_date and transaction_type conditions together, ensuring these are evaluated first before the OR operator. This means the query will return records that meet both of these conditions or records with member_id 'A101' or 'A102', regardless of other conditions.
* Option D does not use parentheses around the borrowed_date and transaction_type conditions but does use them to group the member_id conditions. Since the AND operator has higher precedence than the OR, this query will first evaluate the borrowed_date and transaction_type conditions, then evaluate the grouped member_id conditions. The outcome is records that have a borrowed_date of SYSDATE, a transaction_type of 'RM', and a member_id of either 'A101' or 'A102'.
The results of Options A and D are effectively the same, even though the use of parentheses is different. This is because in both cases, the evaluation of the borrowed_date and transaction_type conditions will be performed first due to their grouping by parentheses in Option A and the precedence of AND over OR in Option D. Therefore, they will both return all records where borrowed_date equals SYSDATE and transaction_type equals 'RM', plus any records where member_id is either 'A101' or 'A102'.
For further details on SQL operator precedence and logical operators, you can refer to Oracle Database SQL Language Reference 12c documentation, specifically the sections on conditional expressions.

問題 #77
View the exhibit and examine the data in the PROJ_TASK_DETAILS table. (Choose the best answer.) The PROJ_TASK_DETAILS table stores information about project tasks and the relation between them.
The BASED_ON column indicates dependencies between tasks.
Some tasks do not depend on the completion of other tasks.
You must generate a report listing all task IDs, the task ID of any task upon which it depends and the name of the employee in charge of the task upon which it depends.
Which query would give the required result?

A. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p FULL OUTER JOIN proj_task_details dON (p.based_on = d.task_id);
B. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p LEFT OUTER JOIN proj_task_details dON (p.based_on = d.task_id);
C. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p JOIN proj_task_details dON (p.task_id = d.task_id);
D. SELECT p.task_id, p.based_on, d.task_in_chargeFROM proj_task_details p JOIN proj_task_details dON (p.based_on = d.task_id);

答案：B

問題 #78
Examine this query:
SELECT TRUNC(ROUND(156.00, -2), -1) FROM DUAL;
What is the result?

A. 0
B. 1
C. 2
D. 3
E. 4

答案：E

解題說明：
Explanation
Reference https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions200.htm

問題 #79
The ORDERS table has a column ORDER_DATE of date type DATE The default display format for a date is DD-MON-RR Which two WHERE conditions demonstrate the correct usage of conversion functions?

A. WHERE order_date> TO_DATE(ADD_MONTHS(SYSDATE,6),'MON DD YYYY');
B. WHERE order_date> TO_DATE('JUL 10 2018','MON DD YYYY');
C. WHERE TO_CHAR(order_date,'MON DD YYYY') ='JAN 20 2019';
D. WHERE ordet_date> TO_CHAR(ADD_MONTHS(SYSDATE, 6),'MON DD YYYY')
E. WHERE order_date IN (TO_DATE ('Oct 21 2018','MON DD YYYY'), TO_CHAR('Nov 21 2018','MON DD YYYY'));

答案：B,C

問題 #80
......

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Daniel Lewis Daniel Lewis

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