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1z1-071資訊，1z1-071考古题推薦

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最新的 Oracle PL/SQL Developer Certified Associate 1z1-071 免費考試真題 (Q204-Q209):

問題 #204
Examine this SELECT statement and view the Exhibit to see its output:

SELECT constraints_name, constraints_type, search_condition, r_constraints_name, delete_rule, status, FROM user_constraints WHERE table_name = 'ORDERS';
Which two statements are true about the output? (Choose two.)

A. The DELETE_RULE column indicates the desired state of related rows in the child table when the corresponding row is deleted from the parent table.
B. The STATUS column indicates whether the table is currently in use.
C. In the second column, 'c' indicates a check constraint.
D. The R_CONSTRAINT_NAME column contains an alternative name for the constraint.

答案：A,C

問題 #205
Which two statements execute successfully?

A. SELECT TO _ CHAR (TO_ DATE ('2019-DEC-25 03:30','YYYY-MON-DD HH12:MI')) FROM DUAL
B. SELECT TO_CHAR('2019-DEC-25 15:30" YY-MON-D HH24:M2', 'NLS_DATE LANGUAGE = AMERICAN') FROM DUAL;
C. SELECT TO _DATE (TO_ CHAR ('2019-DEC-25 03:30', 'YYYY-MON-DD HH12:MI')) FROM DUAL;
D. SELECT TO _ CHAR ('2019-DEC-25 15:30'.'YYYY-MON-DD HH24:MI')
FROM DUAL
E. SELECT TO_ DATE('2019-DEC-25 15:30' 'YYYY-MON-DD HH24:MI', 'NLS_ DATE_ LANGUAGE
=AMERICAN' ) FROM DUAL;

答案：A,E

解題說明：
* A: This statement is correct. It uses the TO_DATE function with a proper date string, format mask, and
* NLS_DATE_LANGUAGE setting.
* B: This statement will not execute successfully because the syntax of the TO_CHAR function is incorrect. The date string should be a DATE data type when used with TO_CHAR, and the format mask and NLS parameter are incorrectly specified.
* C: This statement will not execute successfully because it is redundant to use TO_CHAR and then immediately convert it back to a date with TO_DATE without specifying a proper format mask.
* D: This statement is correct. It converts a string to a DATE using TO_DATE and then back to a string with TO_CHAR, without specifying a format which defaults to the session's NLS_DATE_FORMAT.
* E: This statement will not execute successfully because TO_CHAR is used incorrectly; the first argument must be of DATE data type when you're using a date format mask.
References for the TO_DATE and TO_CHAR functions and their proper usage can be found in the Oracle Database SQL Language Reference 12c documentation.

問題 #206
You want to display 5 percent of the rows from the SALEStable for products with the lowest AMOUNT_SOLD and also want to include the rows that have the same AMOUNT_SOLDeven if this causes the output to exceed 5 percent of the rows.
Which query will provide the required result?

A. SELECT prod_id, cust_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS WITH TIES;
B. SELECT prod_id, cust_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS WITH TIES ONLY;
C. SELECT prod_id, cust_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS ONLY WITH TIES;
D. SELECT prod_id, cust_id, amount_sold
FROM sales
ORDER BY amount_sold
FETCH FIRST 5 PERCENT ROWS ONLY;

答案：A

問題 #207
Which three statements are true about Structured Query Language (SQL)?

A. It guarantees atomicity, consistency, isolation, and durability (ACID) features
B. It best supports relational databases
C. It is used to define encapsulation and polymorphism for a relational table
D. It requires that data be contained in hierarchical data storage
E. It provides independence for logical data structures being manipulated from the underlying physical data storage
F. It is the only language that can be used for both relational and object-oriented databases

答案：B,E

解題說明：
For question 134, the correct options are B and F based on the capabilities and design of SQL:
B . It best supports relational databases: SQL is fundamentally designed to manage and query data in relational databases. It is the standard language used for managing relational database management systems (RDBMS) and for performing all types of data operations within them.
F . It provides independence for logical data structures being manipulated from the underlying physical data storage: SQL allows users to interact with the data at a logical level without needing to know how the data is physically stored. This is known as logical data independence, which is a key feature of SQL in managing databases.
Other options are incorrect because:
A: SQL itself doesn't guarantee ACID properties; these are provided by the database management system's transaction control mechanisms.
C, D, E: These statements are incorrect as SQL does not inherently support object-oriented concepts like encapsulation and polymorphism, is not limited to hierarchical data storage, and is not the only language used for both relational and object-oriented databases.

問題 #208
Evaluate the following CREATE TABLE commands:
CREATE_TABLE orders
(ord_no NUMBER (2) CONSTRAINT ord_pk PRIMARY KEY,
ord_date DATE,
cust_id NUMBER (4) );
CREATE TABLE ord_items
(ord _no NUMBER (2),
item_no NUMBER(3),
qty NUMBER (3) CHECK (qty BETWEEEN 100 AND 200),
expiry_date date CHECK (expiry_date> SYSDATE),
CONSTRAINT it_pk PRIMARY KEY (ord_no, item_no),
CONSTARAINT ord_fk FOREIGN KEY (ord_no) REFERENCES orders (ord_no) );
The above command fails when executed. What could be the reason?

A. SYSDATE cannot be used with the CHECK constraint.
B. The BETWEEN clause cannot be used for the CHECK constraint.
C. The CHECK constraint cannot be placed on columns having the DATE data type.
D. ORD_NO and ITEM_NO cannot be used as a composite primary key because ORD_NO is also the FOREIGN KEY.

答案：A

問題 #209
......

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