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Oracle 1z0-071 certification exam covers a wide range of topics related to SQL, including data retrieval, data manipulation, and schema creation. 1z0-071 exam also covers advanced topics, such as subqueries, set operators, and transaction control. 1z0-071 Exam is designed to test the candidate's ability to use SQL to solve complex problems and to design and implement database solutions.

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Oracle Database SQL Sample Questions (Q375-Q380):

NEW QUESTION # 375
Examine the description of the PROMOTIONStable:

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

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

Answer: C,E

NEW QUESTION # 376
What is true about non-equijoin statement performance?

A. The between condition always performs better than using the >= and <= conditions.
B. The Oracle join syntax performs better than the SQL: 1999 compliant ANSI join syntax.
C. Table aliases can improve performance.
D. The join syntax used makes no difference to performance.
E. The between condition always performs less well than using the >= and <= conditions.

Answer: D

Explanation:
When comparing the performance of different SQL join types and conditions, Oracle SQL optimizations generally ensure that performance is consistent across different syntactical forms of expressing the same logic:
Option A: False. The BETWEEN condition does not inherently perform worse than using >= and <=. Oracle's optimizer typically evaluates these conditions similarly, optimizing the underlying execution based on the data distribution and available indexes.
Option B: False. Oracle's optimizer is designed to handle both Oracle-specific join syntax and ANSI join syntax with equal competence. Performance differences would typically be negligible because the optimizer translates both into an optimal execution plan based on the same underlying mechanisms.
Option C: True. The join syntax used (whether Oracle's traditional syntax or ANSI standard syntax) generally does not affect the performance. Oracle's query optimizer is adept at translating different syntaxes into efficient execution plans.
Option D: False. The assertion that BETWEEN always performs better than >= and <= is incorrect. Performance depends more on factors like indexing, the specific data and distribution, and the Oracle optimizer's capabilities than on the mere choice of syntax.
Option E: False. While table aliases help improve query readability and can prevent ambiguity in SQL queries, they do not inherently improve performance. Their use is a best practice for code clarity and maintenance, not performance enhancement.

NEW QUESTION # 377
Examine the business rule:
Each student can work on multiple projects and each project can have multiple students.
You need to design an Entity Relationship Model (ERD) for optimal data storage and allow for generating reports in this format:
STUDENT_ID FIRST_NAME LAST_NAME PROJECT_ID PROJECT_NAME PROJECT_TASK
Which two statements are true in this scenario? (Choose two.)

A. The ERD must have a M:M relationship between the STUDENTS and PROJECTS entities that must be resolved into 1:M relationships.
B. The ERD must have a 1:M relationship between the STUDENTS and PROJECTS entities.
C. PROJECT_ID must be the primary key in the PROJECTS entity and foreign key in the STUDENTS entity.
D. STUDENT_ID must be the primary key in the STUDENTS entity and foreign key in the PROJECTS entity.
E. An associative table must be created with a composite key of STUDENT_ID and PROJECT_ID, which is the foreign key linked to the STUDENTS and PROJECTS entities.

Answer: A,E

Explanation:
Explanation
References:
http://www.oracle.com/technetwork/issue-archive/2011/11-nov/o61sql-512018.html

NEW QUESTION # 378
Examine the description of the EMP_DETAILS table given below:

Which two statements are true regarding SQL statements that can be executed on the EMP_DETAIL TABLE?

A. An EMP_IMAGE column cannot be included in the ORDER BY clause.
B. You can alter the table to include the NOT NULL constraint on the EMP_IMAGE column.
C. You cannot add a new column to the table with LONG as the data type.
D. An EMP_IMAGE column can be included in the GROUP BY clause.

Answer: A,C

NEW QUESTION # 379
What is true about non-equijoin statement performance?

A. The between condition always performs better than using the >= and <= conditions.
B. The Oracle join syntax performs better than the SQL: 1999 compliant ANSI join syntax.
C. Table aliases can improve performance.
D. The join syntax used makes no difference to performance.
E. The between condition always performs less well than using the >= and <= conditions.

Answer: D

Explanation:
Performance implications related to non-equijoin SQL statements in Oracle Database are often a topic of optimization:
C . The join syntax used makes no difference to performance: In Oracle Database, the performance of a query involving joins is typically more dependent on factors like the underlying data distribution, indexes, optimizer statistics, and system configuration rather than the syntax (ANSI vs Oracle traditional syntax). The optimizer in Oracle is sophisticated enough to interpret different syntactical expressions of joins and optimize them accordingly.
Reference:
Oracle Database Performance Tuning Guide 12c, which discusses the impact of different join syntaxes and how Oracle's optimizer handles them.

NEW QUESTION # 380
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