NEW 1Z0-071 TEST FORMAT | LATEST TEST 1Z0-071 SIMULATIONS

New 1z0-071 Test Format | Latest Test 1z0-071 Simulations

New 1z0-071 Test Format | Latest Test 1z0-071 Simulations

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Oracle Database SQL Sample Questions (Q244-Q249):

NEW QUESTION # 244
When does a transaction complete? (Choose all that apply.)

  • A. When a ROLLBACK command is executed
  • B. When a TRUNCATE statement is executed after the pending transaction
  • C. When a data definition language statement is executed
  • D. When a PL/SQL anonymous block is executed
  • E. When a DELETE statement is executed

Answer: A,B,C


NEW QUESTION # 245
Examine the description of the CUSTOMERS table:
Which three statements will do an implicit conversion?

  • A. SELECT * FROM customers WHERE TO_CHAR(customer_id)='0001';
  • B. SELECT * FROM customers WHERE TO_DATE(insert_date)=DATE'2019-01-01';
  • C. SELECT * FROM customers WHERE insert_date=DATE'2019-01-01';
  • D. SELECT * FROM customers WHERE customer_id=0001;
  • E. SELECT * FROM customers WHERE customer_id='0001';
  • F. SELECT * FROM customers WHERE insert_date'01-JAN-19';

Answer: B,E,F


NEW QUESTION # 246
Examine the commands used to create DEPARTMENT_DETAILS and
COURSE_DETAILS:

You want to generate a report that shows all course IDs irrespective of whether they have corresponding department IDs or not but no department IDs if they do not have any courses.
Which SQL statement must you use?

  • A. SELECT c.course_id, d.department_id FROM course_details c RIGHT OUTER JOIN
    .department_details d ON (c.depatrment_id=d.department_id)
  • B. SELECT c.course_id, d.department_id FROM course_details c FULL OUTER JOIN department_details d ON (c.department_id<>d. department_id)
  • C. SELECT course_id, department_id, FROM department_details d RIGHT OUTER JOIN course_details c USING (department_id)
  • D. SELECT c.course_id, d.department_id FROM course_details c FULL OUTER JOIN department_details d ON (c.department_id=d. department_id)

Answer: D


NEW QUESTION # 247
Examine the structure of the SALES table.

Examine this statement:

Which two statements are true about the SALES1 table? (Choose two.)

  • A. It is created with no rows.
  • B. It will not be created because of the invalid WHERE clause.
  • C. It will have NOT NULL constraints on the selected columns which had those constraints in the SALES table.
  • D. It has PRIMARY KEY and UNIQUE constraints on the selected columns which had those constraints in the SALES table.
  • E. It will not be created because the column-specified names in the SELECT and CREATE TABLE clauses do not match.

Answer: A,C


NEW QUESTION # 248
What is true about non-equijoin statement performance?

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

Answer: C

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 # 249
......

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