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The Oracle 1z1-071 Exam covers a range of topics such as SQL SELECT statements, data manipulation, data control language, data definition language, and transaction control statements. Candidates are required to have a good understanding of SQL syntax, database objects, data modeling, and normalization concepts. 1z1-071 exam also tests the candidate's ability to write efficient and optimized SQL queries that can retrieve and manipulate data from the Oracle database. Candidates who pass the exam can demonstrate their ability to design, implement and manage Oracle databases, which can help them advance their careers in the field of database management.

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Oracle Database SQL Sample Questions (Q182-Q187):

NEW QUESTION # 182
Examine the structure of the PROMOTIONS table: (Choose the best answer.)

Management requires a report of unique promotion costs in each promotion category.
Which query would satisfy this requirement?

A. SELECT promo_category, DISTINCT promo_cost FROM promotions
B. SELECT DISTINCT promo_cost, DISTINCT promo_category FROM promotions;
C. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1
D. SELECT DISTINCT promo_cost, promo_category FROM promotions

Answer: C

NEW QUESTION # 183
View the exhibit and examine the structure of the PROMOTIONS table.

You have to generate a report that displays the promo name and start date for all promos that started after the last promo in the 'INTERNET' category.
Which query would give you the required output?

A. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date IN (SELECT promo_begin_date
FROM promotions
WHERE promo_category= 'INTERNET');
B. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date> ALL (SELECT MAX (promo_begin_date)
FROM promotions) AND
promo_category= 'INTERNET';
C. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date> ANY (SELECT promo_begin_date
FROM promotions
WHERE promo_category= 'INTERNET');
D. SELECT promo_name, promo_begin_date FROM promotions
WHERE promo_begin_date > ALL (SELECT promo_begin_date
FROM promotions
WHERE promo_category = 'INTERNET');

Answer: D

NEW QUESTION # 184
View the Exhibit and examine the data in the PRODUCTS table. (Choose the best answer.) You must display product names from the PRODUCTS table that belong to the
'Software/other' category with minimum prices as either $2000 or $4000 and with no unit of measure.
You issue this query:
SQL > SELECT prod_name, prod_category, prod_min_price FROM products
Where prod_category LIKE '%Other%' AND (prod_min_price = 2000 OR prod_min_price
4000) AND prod_unit_of_measure <> ' ';
Which statement is true?

A. It executes successfully but returns no result.
B. It generates an error because the condition specified for the PROD_CATEGORY column is not valid.
C. It executes successfully and returns the required result.
D. It generates an error because the condition specified for PROD_UNIT_OF_MEASURE is not valid.

Answer: A

NEW QUESTION # 185
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

A. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.
B. The outer query stops evaluating the result set of the inner query when the first value is found.
C. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
D. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.

Answer: B,C

Explanation:
http://www.techonthenet.com/oracle/exists.php

NEW QUESTION # 186
Which two statements are true about the WHERE and HAVING clauses in a SELECT statement?

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

Answer: C,D

Explanation:
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.

NEW QUESTION # 187
......

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