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Oracle Database SQL Sample Questions (Q281-Q286):

NEW QUESTION # 281
View the Exhibit and examine the structure of ORDERS and ORDER_ITEMS tables.
ORDER__ID is the primary key in the ORDERS table. It is also the foreign key in the
ORDER_ITEMS table wherein it is created with the ON DELETE CASCADE option.

Which DELETE statement would execute successfully?

A. DELETE order_id FROM orders WHERE order_total < 1000;
B. DELETE orders WHERE order_total < 1000;
C. DELETE FROM orders WHERE (SELECT order_id FROM order_items);
D. DELETE orders o, order_items i WHERE o.order id = i.order id;

Answer: B

NEW QUESTION # 282
Examine the structure of the EMPLOYEES table.

There is a parent-child relationship between EMPLOYEE_ID and MANAGER_ID.
You want to display the last names and manager IDs of employees who work for the same manager as the employee whose EMPLOYEE_ID is 123.
Which query provides the correct output?

A. SELECT e.last_name, e.manager_idFROM employees e RIGHT OUTER JOIN employees mon (e.employee_id = m.employee_id)WHERE e.employee_id = 123;
B. SELECT e.last_name, m.manager_idFROM employees e LEFT OUTER JOIN employees mon (e.employee_id = m.manager_id)WHERE e.employee_id = 123;
C. SELECT e.last_name, m.manager_idFROM employees e RIGHT OUTER JOIN employees mon (e.manager_id = m.employee_id)AND e.employee_id = 123;
D. SELECT m.last_name, e.manager_idFROM employees e LEFT OUTER JOIN employees mon (e.manager_id = m.manager_id)WHERE e.employee_id = 123;

Answer: D

NEW QUESTION # 283
Which two statements execute successfully?

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

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 # 284
Which three statements are true about views in an Oracle database?

A. Views have no segment.
B. A SELECT statement cannot contain a where clause when querying a view containing a WHERE clause in its defining query
C. Views have no object number.
D. Views can join tables only if they belong to the same schema.
E. A view can be created that refers to a non-existent table in its defining query.
F. Rows inserted into a table using a view are retained in the table if the view is dropped

Answer: A,E,F

NEW QUESTION # 285
Examine the structure of the PROGRAMS table:

Which two SQL statements would execute successfully?

A. SELECT TO_DATE (NVL (SYSDATE-END_DATE, SYSDATE)) FROM programs;
B. SELECT NVL (ADD_MONTHS (END_DATE,1) SYSDATE) FROM programs;
C. SELECT NVL (TO_CHAR (MONTHS_BETWEEN (start-date, end_date)), 'Ongoing') FROM programs
D. SELECT NVL (MONTHS_BETWEEN (start_date, end_date), 'Ongoing') FROM programs;

Answer: B,C

NEW QUESTION # 286
......

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Oracle Database SQL Sample Questions (Q281-Q286):

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