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Oracle Database SQL Sample Questions (Q161-Q166):

NEW QUESTION # 161
View the Exhibit and examine the structure in the EMPLOYEES tables.

Evaluate the following SQL statement:
SELECT employee_id, department_id
FROM employees
WHERE department_id= 50 ORDER BY department_id
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id=90
UNION
SELECT employee_id, department_id
FROM employees
WHERE department_id=10;
What would be the outcome of the above SQL statement?

A. The statement would execute successfully and display all the rows in the ascending order of DEPARTMENT_ID.
B. The statement would not execute because the positional notation instead of the column name should be used with the ORDER BY clause.
C. The statement would not execute because the ORDER BY clause should appear only at the end of the SQL statement, that is, in the last SELECT statement.
D. The statement would execute successfully but it will ignore the ORDER BY clause and display the rows in random order.

Answer: C

NEW QUESTION # 162
Examine these statements which execute successfully:

Both statements display departments ordered by their average salaries.
Which two are true?

A. Only the second statement will display departments with no employees.
B. Both statements will display departments with no employees.
C. Only the first statement will display departments with no employees.
D. Only the second statement will execute successfully if you add E.AVG_SAL to the select list.
E. Both statements will execute successfully If you add e.avg_sal to the select list.
F. Only the first statement will execute successfully if you add E.AVG_SAK to the select list.

Answer: A,E

Explanation:
A . Only the second statement will display departments with no employees. This is true because the second statement uses a LEFT JOIN to include all departments from the departments table, even those without matching entries in the employees table. When there are no employees in a department, the AVG(salary) will be NULL, and the department will still be displayed1.
C . Both statements will execute successfully if you add e.avg_sal to the select list. This is correct. Both statements calculate e.avg_sal as an average salary, either through a subquery or a join operation. Adding e.avg_sal to the select list will display the average salary alongside the departments. However, it's important to note that the first statement will not display departments with no employees because it does not use a join that would allow for NULL values from the employees table2.
Reference:
Understanding SQL JOINs - Stack Overflow1.
Oracle Documentation on JOIN Operations2.
Note: The other options are incorrect because:
B . The first statement will not display departments with no employees since it does not use a join that includes departments without matching employee records.
D . As explained, the first statement will not display departments with no employees.
E . There is a typo in the option; it should be E.AVG_SAL. Even if corrected, the first statement alone would not execute successfully because it does not include a join to bring in the avg_sal value.
F . The second statement will display departments with no employees, but the first statement will not, so this option is incorrect.

NEW QUESTION # 163
View the Exhibit and examine the data in the PRODUCTS table.

You must display product names from the PRODUCTS table that belong to the 'Software/other' category with minimum prices as either $2000 or $4000 and with no unit of measure.
You issue this query:

Which statement is true?

A. It executes successfully but returns no result.
B. It executes successfully and returns the required result.
C. It generates an error because the condition specified for the PROD_CATEGORY column is not valid.
D. It generates an error because the condition specified for PROD_UNIT_OF_MEASURE is not valid.

Answer: A

NEW QUESTION # 164
View the Exhibit and examine the data in the PRODUCTS table.

You must display product names from the PRODUCTS table that belong to the 'Software/other' category with minimum prices as either $2000 or $4000 and with no unit of measure.
You issue this query:

Which statement is true?

A. It executes successfully but returns no result.
B. It executes successfully and returns the required result.
C. It generates an error because the condition specified for the PROD_CATEGORY column is not valid.
D. It generates an error because the condition specified for PROD_UNIT_OF_MEASURE is not valid.

Answer: A

NEW QUESTION # 165
Which two statements are true about date/time functions in a session where NLS_DATE_FORMAT is set to DD-MON-YYYY HH24:MI:SS?

A. CURRENT_TIMESTAMP returns the same date and time as SYSDATE with additional details of fractional seconds.
B. CURRENT_TIMESTAMP returns the same date as CURRENT_DATE.
C. CURRENT_DATE returns the current date and time as per the session time zone.
D. SYSDATE and CURRENT_DATE return the current date and time set for the operating system of the database server.
E. SYSDATE can be queried only from the DUAL table.
F. SYSDATE can be used in expressions only if the default date format is DD-MON-RR.

Answer: C,E

NEW QUESTION # 166
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