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Oracle Database SQL Sample Questions (Q199-Q204):

NEW QUESTION # 199
In which three situations does a transaction complete?

A. when a data definition language (DDL) statement is executed
B. when a DELETEstatement is executed
C. when a TRUNCATEstatement is executed after the pending transaction
D. when a ROLLBACKcommand is executed
E. when a PL/SQL anonymous block is executed

Answer: A,C,D

Explanation:
Explanation
Explanation/Reference:
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14220/transact.htm

NEW QUESTION # 200
Which two statements execute successfully?

A. SELECT TO _ CHAR (TO_ DATE ('2019-DEC-25 03:30','YYYY-MON-DD HH12:MI')) FROM DUAL
B. SELECT TO_CHAR('2019-DEC-25 15:30", YY-MON-D HH24:M2', 'NLS_DATE LANGUAGE = AMERICAN') FROM DUAL;
C. SELECT TO_ DATE('2019-DEC-25 15:30', 'YYYY-MON-DD HH24:MI', 'NLS_ DATE_ LANGUAGE
=AMERICAN' ) FROM DUAL;
D. SELECT TO _DATE (TO_ CHAR ('2019-DEC-25 03:30', 'YYYY-MON-DD HH12:MI')) FROM DUAL;
E. SELECT TO _ CHAR ('2019-DEC-25 15:30'.'YYYY-MON-DD HH24:MI')
FROM DUAL

Answer: A,C

Explanation:
A: This statement is correct. It uses the TO_DATE function with a proper date string, format mask, and NLS_DATE_LANGUAGE setting.
B: This statement will not execute successfully because the syntax of the TO_CHAR function is incorrect. The date string should be a DATE data type when used with TO_CHAR, and the format mask and NLS parameter are incorrectly specified.
C: This statement will not execute successfully because it is redundant to use TO_CHAR and then immediately convert it back to a date with TO_DATE without specifying a proper format mask.
D: This statement is correct. It converts a string to a DATE using TO_DATE and then back to a string with TO_CHAR, without specifying a format which defaults to the session's NLS_DATE_FORMAT.
E: This statement will not execute successfully because TO_CHAR is used incorrectly; the first argument must be of DATE data type when you're using a date format mask.
Reference for the TO_DATE and TO_CHAR functions and their proper usage can be found in the Oracle Database SQL Language Reference 12c documentation.

NEW QUESTION # 201
Which two statements are true about a full outer join?

A. It returns matched and unmatched rows from both tables being joined.
B. The Oracle join operator (+) must be used on both sides of the join condition in the WHERE clause.
C. It returns only unmatched rows from both tables being joined.
D. It includes rows that are returned by a Cartesian product.
E. It includes rows that are returned by an inner join.

Answer: A,E

NEW QUESTION # 202
Examine the structure of the BOOKS_TRANSACTIONS table:
You want to display the member IDs, due date, and late fee as $2 for all transactions.
Which SQL statement must you execute?

A. SELECT member_id AS "MEMBER ID", due_date AS "DUE DATE", $2 AS "LATE FEE" FROM BOOKS_TRANSACTIONS
B. SELECT member_id AS MEMBER_ID, due_date AS DUE_DATE, $2 AS LATE_FEE
FROM BOOKS_TRANSACTIONS
C. SELECT member_id 'MEMBER ID', due_date 'DUE DATE', '$2 AS LATE FEE' FROM BOOKS_TRANSACTIONS;
D. SELECT member_id AS "MEMBER ID", due_date AS "DUE DATE", '$2' AS "LATE FEE" FROM BOOKS_TRANSACTIONS

Answer: D

NEW QUESTION # 203
Examine the structure of the EMPLOYEES table. (Choose the best answer.)

You must display the details of employees who have manager with MANAGER_ID 100, who were hired in the past 6 months and who have salaries greater than 10000.

A. (SELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000UNION ALLSELECT last_name, hire_date, salaryFROM employeesWHERE manager_ID = (SELECT employee_id FROM employees WHERE employee_id = 100))UNIONSELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE -180;
B. SELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000UNION ALL SELECT last_name, hire_date, salaryFROM employeesWHERE manager_ID = (SELECT employee_id FROM employees WHERE employee_id = 100)INETRSECTSELECT last_name, hire_date, salaryFROM employees WHERE hire_date > SYSDATE- 180;
C. SELECT last_name, hire_date, salaryFROM employeesWHERE manager_id = (SELECT employee_id FROM employees WHERE employee_id = 100)UNION ALL(SELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE -180INTERSECTSELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000);
D. SELECT last_name, hire_date, salaryFROM employeesWHERE manager_id = (SELECT employee_id FROM employees WHERE employee_id = '100')UNIONSELECT last_name, hire_date, salaryFROM employeesWHERE hire_date > SYSDATE -180INTERSECTSELECT last_name, hire_date, salaryFROM employeesWHERE salary > 10000;

Answer: D

NEW QUESTION # 204
......

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