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NEW QUESTION # 196
Examine the description of the EMPLOYEES table:
The session time zone is the same as the database server
Which two statements will list only the employees who have been working with the company for more than five years?
Answer: A,B
NEW QUESTION # 197
Examine this incomplete query:
SELECT DATA'2019-01-01'+<INTERVAL CLAUSE>
FROM DUAL;
Which three clauses can replace<INTERVAL CLAUSE>ti add 22 hours to the date?
Answer: A,B,D
Explanation:
In Oracle SQL, adding hours to a date can be done using the INTERVAL keyword with appropriate clauses:
* Option C: INTERVAL '12' HOUR
* Adds exactly 12 hours to a date.
* Option D: INTERVAL '720' MINUTE
* Since 720 minutes equal 12 hours, this correctly adds 12 hours to a date.
* Option F: INTERVAL '11:60' HOUR TO MINUTE
* This interval represents 11 hours and 60 minutes, which effectively adds up to 12 hours.
Options A, B, and E contain incorrect syntax or do not match the required addition of 22 hours as specified in the question.
NEW QUESTION # 198
Examine this list of requirements for a sequence:
1. Name:EMP_SEQ
2. First value returned:1
3. Duplicates are never permitted.
4. Provide values to be inserted into the EMPLOYEES.EMPLOYEE_ID COLUMN.
5. Reduce the chances of gaps in the values.
Which two statements will satisfy these requirements?
Answer: B,E
Explanation:
* A: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 NOCACHE;' is correct for ensuring unique values without gaps as much as possible by not caching sequence numbers, which might otherwise be lost in a system crash.
* B: CYCLE allows the sequence to restart when its max/min value is reached, which does not help with requirement 3 (duplicates are never permitted). Therefore, B is incorrect.
* C: This lacks the necessary attributes like START WITH and INCREMENT BY which are crucial to defining a sequence. Thus, statement C is incorrect.
* D: 'CREATE SEQUENCE emp_seq START WITH 1 CACHE;' might introduce gaps due to the caching of sequence numbers. This statement is somewhat contrary to requirement 5.
* E: 'CREATE SEQUENCE emp_seq START WITH 1 INCREMENT BY 1 CACHE;' will provide continuous unique values, but may include gaps when the cache is lost due to a restart, yet it is more efficient and still generally aligns with the requirements. Hence, statement E is considered correct.
* F: This lacks detail and is too ambiguous, lacking the necessary parameters. Therefore, F is incorrect.
NEW QUESTION # 199
Which two statements are true about * _TABLES views?
Answer: A,E
NEW QUESTION # 200
View the exhibit and examine the description of the DEPARTMENTS and EMPLOYEES tables.
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?
Answer: D
Explanation:
Explanation
Natural join needs only one column to be the same in each table. The EMPLOYEES and DEPARTMENTS tables have two columns that are the same (Department_ID and Manager_ID)
NEW QUESTION # 201
......
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