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Oracle 1z1-071 시험은 Oracle 데이터베이스와 함께 작업하고자 하는 전문가들에게 필수적인 인증서입니다. 이 인증서는 후보자의 SQL 및 Oracle 데이터베이스에 대한 기술과 지식을 검증합니다. Oracle은 데이터베이스 산업의 중요한 선수자이며, Oracle 1z1-071 인증서는 고용주들에게 높은 평가를 받습니다. 이 인증서는 후보자가 SQL에 대한 견고한 이해를 가지고 있으며 Oracle 데이터베이스와 함께 작업할 수 있는 능력을 갖추고 있다는 것을 입증합니다.

최신 Oracle PL/SQL Developer Certified Associate 1z0-071 무료샘플문제 (Q217-Q222):

질문 # 217
Which three statements are true about indexes and their administration in an Oracle database?

A. A DROP INDEX statement always prevents updates to the table during the drop operation
B. An index can be created as part of a CREATE TABLE statement.
C. An INVISIBLE index is not maintained when Data Manipulation Language (DML) is performed on its underlying table.
D. A UNIQUE and non-unique index can be created on the same table column
E. If a query filters on an indexed column then it will always be used during execution of the query
F. A descending index is a type of function-based index

정답：B,D,F

설명：
A). This statement is incorrect. An INVISIBLE index is maintained during DML operations just like a VISIBLE index. The difference is that an INVISIBLE index is not used by the optimizer unless explicitly hinted. B. This statement is correct. When creating a table, you can define indexes on one or more columns as part of the table definition. C. This statement is incorrect. While a DROP INDEX statement will drop the index, it does not always prevent updates to the table. If the index is marked as unusable or is an invisible index, for example, updates can still be performed. D. This statement is correct. It is possible to have both a UNIQUE index and a non-unique index on the same column. The UNIQUE index enforces the uniqueness of column values, while the non-unique index does not. E. This statement is correct to some extent. Descending indexes are not function-based indexes per se, but they are indexes on which the data is sorted in descending order, as opposed to the default ascending order. However, descending indexes are conceptually related to function-based indexes because they alter the way the indexed data is stored. F. This statement is incorrect.
The use of an index in query execution depends on the optimizer's decision, which is based on statistics and the cost associated with using the index. There are situations where the optimizer may choose a full table scan even if there is an index on the filter column.
References can be found in the Oracle Database Concepts Guide and the SQL Language Reference documentation, which detail the behavior of indexes and how they are managed within the Oracle database.

질문 # 218
Examine the description of the PROMTIONS table:

You want to display the unique promotion costs in each promotion category.
Which two queries can be used?

A. SELECT DISTINCT promo_category ||'has'|| promo_cost AS COSTS FROM promotions ORDER BY 1;
B. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;
C. SELECT DISTINCT promo_cost ||' in' II DISTINCT promo_category FROM promotions ORDER BY 1;
D. SELECT promo_category, DISTINCT promo_cost PROM promotions ORDER BY 2:
E. SELECT promo_cost, | pxomo_category FROM promotions ORDER BY 1;

정답：A,B

질문 # 219
Which two statements are true about the WHERE and HAVING clauses in a SELECT statement?

A. Aggregating functions and columns used in HAVING clauses must be specified in these SELECT list of a query.
B. The WHERE clause can be used to exclude rows after dividing them into groups
C. WHERE and HAVING clauses can be used in the same statement only if applied to different table columns.
D. The HAVING clause can be used with aggregating functions in subqueries.
E. The WHERE clause can be used to exclude rows before dividing them into groups.

정답：A,E

설명：
In SQL, the WHERE and HAVING clauses are used to filter records; the WHERE clause is applied before grouping the records, while the HAVING clause is used after grouping the records, particularly when using aggregation functions.
* Statement D is true because the HAVING clause is used to filter groups based on the result of aggregate functions. Therefore, any column or aggregate function appearing in the HAVING clause must also appear in the SELECT list of the query, unless it is used as part of an aggregate function.
* Statement E is true because the WHERE clause is designed to filter rows before they are grouped into aggregate groups in a GROUP BY clause. This is a fundamental aspect of SQL that optimizes query performance by reducing the number of rows to be processed in the aggregate phase.
* Statements A, B, and C are incorrect based on the following:
* A is incorrect because the WHERE clause does not operate on groups but on individual rows before grouping.
* B is misleading; while WHERE and HAVING can be used in the same statement, their usage is not restricted to different columns. They perform different functions (row-level filtering vs.
group-level filtering).
* C is incorrect because subqueries using aggregate functions typically do not use HAVING clauses; rather, HAVING is used in the outer query to filter the results of aggregates.

질문 # 220
Examine the description of the EMPLOYEES table:

The session time zone is the same as the database server
Which two statements will list only the employees who have been working with the company for more than five years?

A. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 12> 3
B. SELECT employee_ name FROM employees WHERE (SYSDATE - hire_ data) / 365>5
C. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 12> 3
D. SELECT employee_ name FROM employees WHERE (CUNACV_ DATE - hire_ data / 12> 3
E. SELECT employee_ name FROM employees WHERE (SYSTIMESTAMP - hire_ data) / 365>
F. SELECT employee_ name FROM employees WHERE (CUARENT_ DATE - hire_ data / 365>5

정답：B,F

질문 # 221
View the Exhibit and examine PRODUCTS and ORDER_ITEMS tables.

You executed the following query to display PRODUCT_NAME and the number of times the product has been ordered:
SELECT p.product_name, i.item_cnt
FROM (SELECT product_id, COUNT (*) item_cnt
FROM order_items
GROUP BY product_id) i RIGHT OUTER JOIN products p
ON i.product_id = p.product_id;
What would happen when the above statement is executed?

A. The statement would execute successfully to produce the required output.
B. The statement would not execute because the ITEM_CNT alias cannot be displayed in the outer query.
C. The statement would not execute because the GROUP BY clause cannot be used in the inline.
D. The statement would not execute because inline views and outer joins cannot be used together.

정답：A

질문 # 222
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