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Oracle Database SQL Sample Questions (Q306-Q311):

NEW QUESTION # 306
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.

A. MINUS
B. UNION
C. UNION ALL
D. INTERSECT

Answer: B,C

Explanation:
Explanation/Reference:

NEW QUESTION # 307
You must create a table for a banking application.
One of the columns in the table has these requirements:
A column to store the duration of a short team loan
The data should be stored in a format supporting DATE arithmetic with DATE datatypes without using conversion functions.
The maximum loan period is 30 days.
Interest must be calculated based on the number of days for which the loan remains unpaid.
Which data type would you use?

A. INTERVAL YEAR TO MONTH
B. INTERVAL DAY TO SECOND
C. TIMESTAMP
D. DATE
E. NUMBER

Answer: B

NEW QUESTION # 308
Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true?

A. Unique key constraints defined on the COUNTRY column are removed.
B. A new column, COUNTRY, can be added to the DEPARTMENTS table after executing the command.
C. Views created in the DEPARTMENTS table that include the COUNTRY column are automatically modified and remain valid.
D. Synonyms existing of the DEPARTMENTS table would have to be re-created.
E. Indexes created on the COUNTRY column exist until the DROP UNUSED COLUMNS command is executed.

Answer: A,B

NEW QUESTION # 309
SCOTTis a user in the database.
Evaluate the commands issued by the DBA:

Which statement is true regarding the execution of the above commands?

A. Statement 2 would not execute because system privileges and object privileges cannot be granted together in a single GRANTcommand.
B. Statement 1 would not execute because the WITH GRANToption is missing.
C. Statement 1 would not execute because the IDENTIFIED BY <password>clause is missing.
D. Statement 3 would not execute because role and system privileges cannot be granted together in a single GRANTstatement.

Answer: A

NEW QUESTION # 310
Examine the description of the EMPLOYEES table:

Which statement will fail?

A. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 GROUP BY department_id
HAVING COUNT(*) >= 3;
B. SELECT department_id, COUNT (*)
FROM employees
HAVING department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;
C. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 HAVING COUNT(*) >= 3
GROUP BY department_id;
D. SELECT department_id, COUNT (*)
FROM employees
WHERE department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;

Answer: D

Explanation:
The statement that will fail is B. In Oracle SQL, the WHERE clause cannot contain aggregate functions directly. The HAVING clause is used instead to apply conditions that involve aggregates, but it is applied after the GROUP BY clause.
A . While the HAVING clause is used before the GROUP BY clause which is not standard SQL syntax, Oracle SQL may still execute it successfully due to its flexibility in syntax.
B . This statement will fail because it uses an aggregate function, COUNT(*), in the WHERE clause, which is not allowed. The correct approach is to use the HAVING clause to filter the results of aggregate functions after the GROUP BY clause.
C . This statement is correct; it places the HAVING clause after the GROUP BY clause, applying the filter on the aggregated count.
D . This is a correctly constructed statement with the WHERE clause filtering individual records before grouping, and the HAVING clause filtering groups based on the aggregate function.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "WHERE Clause" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "HAVING Clause"

NEW QUESTION # 311
......

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