[Feb-2024] Free 1z0-071 Exam Questions 1z0-071 Actual Free Exam Questions
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NEW QUESTION # 125
Which statement is true about SQL query processing in an Oracle database instance?
(Choose the best answer.)
- A. During optimization, execution plans are formulated based on the statistics gathered by the database instance, and the lowest cost plan is selected for execution.
- B. During executing, the oracle server may read data from storage if the required data is not already in memory.
- C. During parsing, a SQL statement containing literals in the WHERE clause that has been executed by any session and which is cached in memory, is always reused for the current execution.
- D. During row source generation, rows that satisfy the query are retrieved from the database and stored in memory.
Answer: B
NEW QUESTION # 126
View the Exhibits and examine the structure of the COSTSand PROMOTIONStables.
You want to display PROD_IDSwhose promotion cost is less than the highest cost PROD_IDin a promotion time interval.
Examine this SQL statements:
What will be the result?
Exhibit 1.
Exhibit 2.
- A. It gives an error because the ALLkeyword is not valid
- B. It executes successfully but does not give the required result
- C. It gives an error because the GROUP BYclause is not valid
- D. It executes successfully and gives the required result
Answer: D
NEW QUESTION # 127
Which two are true about dropping columns from a table?
- A. A column can be removed only if it contains no data.
- B. A column that is referenced by another column in any other table cannot be dropped.
- C. Multiple columns can be dropped simultaneously using the ALTER TABLE command.
- D. A column drop is implicitly committed.
- E. A column must be set as unused before it is dropped from a table.
- F. A primary key column cannot be dropped.
Answer: C,F
NEW QUESTION # 128
On your Oracle 12c database, you invoked SQL *Loader to load data into the EMPLOYEEStable in the HR schema by issuing the following command:
$> sqlldr hr/hr@pdb table=employees
Which two statements are true regarding the command? (Choose two.)
- A. It succeeds with default settings if the EMPLOYEEStable belonging to HR is already defined in the database.
- B. It fails because no SQL *Loader data file location is specified.
- C. It fails because no SQL *Loader control file location is specified.
- D. It fails if the HR user does not have the CREATE ANY DIRECTORYprivilege.
Answer: A,D
Explanation:
Explanation/Reference:
NEW QUESTION # 129
Examine the structure of the SHIPMENTS table:
You want to generate a report that displays the PO_IDand the penalty amount to be paid if the SHIPMENT_DATEis later than one month from the PO_DATE. The penalty is $20 per day.
Evaluate the following two queries:
Which statement is true regarding the above commands?
- A. Only the second query executes successfully and gives the correct result.
- B. Both execute successfully and give correct results.
- C. Only the first query executes successfully and gives the correct result.
- D. Only the second query executes successfully but gives a wrong result.
- E. Only the first query executes successfully but gives a wrong result.
Answer: C
NEW QUESTION # 130
Which statement will return the last sequence number generated by the EMP_ SEQ sequence?
- A. SELECT NEXTVAL FROM emp_ seq;
- B. SELECT CURRVAL FROM emp_ seq;
- C. SELECT emp_ seq. CURRVAL FROM DUAL;
- D. SELECT emp_ seq . NEXTVAL FROM DUAL;
Answer: D
NEW QUESTION # 131
You execute these commands:
CREATE TABLE customers (customer_id INTEGER, customer_name VARCHAR2 (20) ) TNSERT INTO customers VALUES (1, 'Customer 1 ' ) ; SAVEPOTNT post_insert; INSERT INTO customers VALUES (2, 'Customer 2');
<TODO>
SELECT COUNT(*) FROM customers;
Which two, used independently, can replace <todo> so the query returns 1?
- A. COMMIT TO SAVEPOINT post_insert;
- B. ROLLBACK TO SAVEPOINT post_insert;
- C. ROLLBACK,"
- D. commit;
- E. ROLLBACK TO post_insert;
Answer: B,E
NEW QUESTION # 132
View the Exhibit and examine the structure of the EMPLOYEES and JOB_HISTORY tables.
Examine this query which must select the employee IDs of all the employees who have held the job SA_MAN at any time during their employment.
SELECT employee_id
FROM employees
WHERE job_id = 'SA_MAN'
-------------------------------------
SELECT employee_id
FROM job_history
WHERE job_id='SA_MAN';
Choose two correct SET operators which would cause the query to return the desired result. (Choose two.)
- A. MINUS
- B. UNION ALL
- C. UNION
- D. INTERSECT
Answer: B,C
NEW QUESTION # 133
You must write a query that prompts users for column names and conditions every time it is executed.
The user must be prompted only once for the table name.
Which statement achieves those objectives?
- A. SELECT &col1, &col2
FROM "&table"
WHERE &condition = &cond; - B. SELECT &col1, &col2
FROM &&table
WHERE &condition = &&cond - C. SELECT &col1, '&col2'
FROM &table
WHERE &&condition = '&cond'; - D. SELECT &col1, &col2
FROM &&table
WHERE &condition = &cond;
Answer: D
NEW QUESTION # 134
View the exhibit and examine the structure of the CUSTOMERS table.
Which two tasks would require subqueries or joins to be executed in a single statement?
- A. finding the number of customers, in each city, whose credit limit is more than the average credit limit of all the customers
- B. listing of customers who do not have a credit limit and were born before 1980
- C. listing of those customers, whose credit limit is the same as the credit limit of customers residing in the city 'Tokyo'.
- D. finding the average credit limit of male customers residing in 'Tokyo' or 'Sydney'
- E. finding the number of customers, in each city, who's marital status is 'married'.
Answer: A,C
NEW QUESTION # 135
Examine this SQL statement:
Which two are true?
- A. The DELETE statement executes successfully even if the subquery selects multiple rows.
- B. All existing rows in the EMPLOYEES table are deleted.
- C. The subquery is executed for every row in the employees table.
- D. The subquery is not a correlated subquery.
- E. The subquery is executed before the DELETE statement is executed.
Answer: C,E
NEW QUESTION # 136
Which two are true about rollbacks?
- A. Data Control L anguage (DCL) statements, such as GRANT and REVOKE, can be rolled back.
- B. A transaction interrupted by a system failure is automatically rolled back.
- C. If the ROLLBACK statement is used without TO SAVEPOINT, then all savepoints in the transaction are deleted .
- D. The ROLLBACK statement does not release locks resulting from table updates.
- E. Data consistency is not guaranteed after a rollback.
Answer: B,C
NEW QUESTION # 137
Which three statements are true about dropping and unused columns in an Oracle database?
- A. Partition key columns cannot be dropped.
- B. An UNUSED column's space is remained automatically when the row containing that column is next queried.
- C. A DROP COLUMN command can be rolled back.
- D. A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
- E. An UNUSED column's space is remained automatically when the block containing that column is next queried.
- F. A column that is set to NNUSED still counts towards the limit of 1000 columns per table.
Answer: A,D,F
NEW QUESTION # 138
View the exhibit and examine the description of the DEPARTMENTSand EMPLOYEEStables.
You wrote this SQL statement to retrieve EMPLOYEE_ID, FIRST_NAME, and DEPARTMENT NAME, for all employees:
SELECT employee_id, first_name, department_name
FROM employees
NATURAL JOIN departments;
The desired output is not obtained after executing the above SQL statement. What could be the reason for this?
- A. The NATURAL JOINclause is missing the USINGclause.
- B. The EMPLOYEESand DEPARTMENTStables have more than one column with the same column name and data type.
- C. The table prefix is missing for the column names in the SELECTclause.
- D. The DEPARTMENTStable is not used before the EMPLOYEEStable in the FROMclause.
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Natural join needs only one column to be the same in each table. The EMPLOYEESand DEPARTMENTS tables have two columns that are the same (Department_ID and Manager_ID)
NEW QUESTION # 139
Examine thee statements which execute successfully:
CREATE USER finance IDENTIFIED BY pwfin;
CREATE USER fin manager IDENTIETED BY pwmgr;
CREATE USER fin. Clerk IDENTIFIED BY pwclerk;
GRANT CREATE SESSON 20 finance, fin clerk;
GRANT SELECT ON scott. Emp To finance WITH GRANT OPTION;
CONNECT finance/pwfin
GRANT SELECT ON scott. emp To fin_ _clerk;
Which two are true?
- A. User FINANCE is unable to grant ALL on SCOTT.ENP to FIN MANAGER.
- B. User FIN CLERK can grant SELECT on SCORT, ENP to user FIN MANAGER.
- C. User FINANCE can grant CREATE SESSION to user FIN MANAGER.
- D. Revoking SELECT on SCOTT. EMP from user FINANCE will also revoke the privilege from user FIN_ CLERK.
- E. Dropping user FINANCE will automatically revoke SELECT on SCOTT. EMP from user FIN _ CLERK
Answer: A,D
NEW QUESTION # 140
See the Exhibit and examine the structure of the PROMOTIONS table:
Using the PROMOTIONS table,
you need to find out the average cost for all promos in the range $0-2000 and $2000-5000 in category A.
You issue the following SQL statements:
What would be the outcome?
- A. It executes successfully and gives the required result.
- B. It generates an error because CASE cannot be used with group functions.
- C. It generates an error because NULL cannot be specified as a return value.
- D. It generates an error because multiple conditions cannot be specified for the WHEN clause.
Answer: A
Explanation:
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END
NEW QUESTION # 141
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