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Oracle 1z1-071 Exam consists of 73 multiple-choice questions that must be completed in 100 minutes. The questions are designed to test the candidate's understanding of SQL and its various functions. 1z1-071 exam covers topics such as creating and managing tables, manipulating data, using SQL functions, and controlling user access to data. 1z1-071 Exam also covers the basics of SQL syntax and how to write SQL statements.

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Oracle Database SQL Sample Questions (Q315-Q320):

NEW QUESTION # 315
Examine this SQL statement:
DELETE FROM employees e
WHERE EXISTS
(SELECT'dummy'
FROM emp_history
WHERE employee_id = e.employee_id)
Which two are true?

A. The DELETE statement executes successfully even if the subquery selects multiple rows.
B. All existing rows in the EMPLOYEE table are deleted.
C. The subquery is not a correlated subquery.
D. The subquery is executed before the DELETE statement is executed.
E. The subquery is executed for every row in the EMPLOYEES table.

Answer: A,E

Explanation:
The provided DELETE statement uses a correlated subquery to determine which rows should be deleted from the EMPLOYEES table.
A . The subquery is indeed executed for every row in the EMPLOYEES table. This is because it references e.employee_id, which is a column from the outer query, making it a correlated subquery.
B . The subquery is a correlated subquery, as explained above.
C . The subquery is executed for each row, not before the DELETE statement.
D . Not all existing rows in the EMPLOYEES table are deleted, only those that have a corresponding employee_id in the EMP_HISTORY table.
E . The DELETE statement executes successfully even if the subquery selects multiple rows because the EXISTS condition only checks for the presence of rows, not their count.
Reference:
Oracle Database SQL Language Reference 12c Release 1 (12.1), DELETE Statement Oracle Database SQL Language Reference 12c Release 1 (12.1), Subquery Factoring Oracle Database SQL Language Reference 12c Release 1 (12.1), Correlated Subqueries

NEW QUESTION # 316
An Oracle database server session has an uncommitted transaction in progress which updated 5000 rows in a table.
In which three situations does the transaction complete thereby committing the updates?

A. when a DBA issues a successful shutdown immediate statement and the user then issues a commit
B. when a commit statement is issued by the same user from another session in the same database instance
C. when the session logs out successfully
D. when a DBA issues a successful shutdown transactional statement and the user then issues a commit
E. when a create index statement is executed successfully in the same session
F. when a CREATE TABLE AS SELECT statement is executed unsuccessfully in the same session

Answer: C,D,E

NEW QUESTION # 317
Which three statements are true about an ORDER BY clause?

A. An ORDER BY clause always sorts NULL values last.
B. An ORDER BY clause can perform a linguistic sort
C. An ORDR BY clause will always precede a HAVI NG clause if both are used in the same top-level
D. By default an ORDERBY clause sorts rows in ascending order
E. An ORDER BY clause can perform a binary sort

Answer: B,D,E

Explanation:
In Oracle Database 12c, the behavior of the ORDER BY clause is guided by several rules:
Option B: An ORDER BY clause can perform a binary sort.
A binary sort is the default sorting mechanism in Oracle Database, which is based on the binary representation of the data.
Option C: An ORDER BY clause can perform a linguistic sort.
Oracle supports linguistic sorting through the use of the NLS_SORT parameter, which can be set to various linguistic and cultural norms.
Option D: By default, an ORDER BY clause sorts rows in ascending order.
If no ASC or DESC keyword is specified, Oracle will sort the results in ascending order by default.
Options A and E are incorrect:
Option A is not universally true; the position of NULL values in the sort order can be controlled by settings or specific SQL syntax (NULLS FIRST or NULLS LAST).
Option E is incorrect as the HAVING clause filters groups after data has been grouped by the GROUP BY clause and cannot be logically placed before ORDER BY in processing order.

NEW QUESTION # 318
View the Exhibit and examine the structure of the ORDERS table.
Which UPDATE statement is valid?

A. UPDATE ordersSET order_date = '12-mar-2007',order_total = NULLWHERE order_id
2455;
B. UPDATE ordersSET order_date = '12-mar-2007',order_total IS NULLWHERE order_id
= 2455;
C. UPDATE ordersSET order_date = TO_DATE('12-mar-2007','dd-mon-yyyy'),SET order_total = TO_NUMBER (NULL)WHERE order_id = 2455;
D. UPDATE ordersSET order_date = '12-mar-2007',AND order_total
TO_NUMBER(NULL)WHERE order_id = 2455;

Answer: A

NEW QUESTION # 319
Which two statements are true about Oracle databases and SQL?

A. When you execute an UPDATE statement, the database instance locks each updated row.
B. Updates performed by a database user can be rolled back by another user by using the ROLLBACK command.
C. A user can be the owner of multiple schemas In the same database.
D. A query can access only tables within the same schema.
E. The database guarantees read consistency at select level on user-created tablers.

Answer: A,E

Explanation:
B). True. Oracle databases guarantee read consistency at the transaction level, meaning that each query can only see data that has been committed before the query began executing.
C). True. When an UPDATE statement is executed, Oracle locks each row as it is updated to prevent other transactions from modifying it until the transaction is committed or rolled back.
A is incorrect because updates made by one user cannot be rolled back by another user. D is incorrect because a query can access tables in other schemas if proper permissions are granted. E is incorrect because a user can own only one schema, which has the same name as the user in an Oracle database.

NEW QUESTION # 320
......

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1z1-071 Dumps PDF: Oracle Database SQL & 1z1-071 Test Questions & Oracle Database SQL Dumps Torrent

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Oracle Database SQL Sample Questions (Q315-Q320):

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