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Oracle Database SQL Sample Questions (Q186-Q191):

NEW QUESTION # 186
Examine this SQL statement:

Which two are true? (Choose two.)

A. All existing rows in the ORDERStable are updated
B. The UPDATEstatement executes successfully even if the subquery selects multiple rows
C. The subquery is not a correlated subquery
D. The subquery is executed before the UPDATEstatement is executed
E. The subquery is executed for every updated row in the ORDERStable

Answer: A,D

NEW QUESTION # 187
You create a table by using this command:
CREATE TABLE rate_list (rate NUMBER(6,2));
Which two are true about executing statements?

A. INSERT INTO rate_list VALUES (87654. 556) inserts the value as 87654.6.
B. INSERT INTO rate_list VALUES (-99.99) inserts the value as 99.99.
C. INSERT INTO rate_list VALUES (-.9) inserts the value as -.9.
D. INSERT INTO rate_list VALUES (-10) produces an error.
E. INSERT INTO rate_list VALUES (0.999) produces an error.
F. INSERT INTO rate_list VALUES (0.551) inserts the value as .55.

Answer: C,F

Explanation:
The behavior of data insertion into a table with a specific numeric format in Oracle Database 12c can be explained as follows:
* A. INSERT INTO rate_list VALUES (-.9) inserts the value as -.9: This is correct. The value -.9 is within the precision defined by the table column (NUMBER(6,2)), where 6 is the total number of digits (including both sides of the decimal point), and 2 is the number of digits after the decimal point.
* E. INSERT INTO rate_list VALUES (0.551) inserts the value as .55: Oracle rounds the number to the nearest value that fits the specified scale of 2. Thus, 0.551 rounds down to 0.55.
References:
* Oracle Database SQL Language Reference 12c, particularly sections on data types and numeric precision.

NEW QUESTION # 188
You execute this command:
ALTER TABLE employees SET UNUSED(department_id)
Which two are true? (Choose two.)

A. The DEPARTMENT_IDcolumn is set to null for all rows in the table.
B. A new column with the name DEPARTMENT_IDcan be added to the EMPLOYEEStable.
C. A query can be display data from the DEPARTMENT_IDcolumn.
D. No updates can be made to the data in the DEPARTMENT_IDcolumn.
E. The storage space occupied by the DEPARTMENT_IDcolumn is released only after a COMMITis issued.
F. The DEPARTMENT_IDcolumn can be recovered from the recycle bin.

Answer: A,B

Explanation:
If a new column is added to a table, the column is initially NULL
Reference:
https://docs.oracle.com/cd/B28359_01/server.111/b28310/tables006.htm#ADMIN11005

NEW QUESTION # 189
Which two statements will return the names of the three employees with the lowest salaries?

A. SELECT last_ name, salary
FBOM employees
WEERE
ORDER BY SELECT
ROINUM <= 3
salary FROM
employees);
B. SELECT last name, salary
FROM employees
ORDER BY salary
FETCE FIRST 3 RONS ONLY;
C. SELECT last_ name, salary
FROM employees
FETCH FIRST 3 ROWS ONLY
ORDER BY salary;
D. SELECT last_ name, salary
FROM employees
WHERE ROWNUM <=3
ORDER BY salary
E. SELECT last_ name, salary
FROM
(SELECT" FROM employees ORDER BY salary)
WHERE ROWNUM <=3

Answer: B,E

NEW QUESTION # 190
Which two queries execute successfully?

A. SELECT NULLIF(NULL, 100) FROM DUAL
B. SELECT CO ALESCE(100, 'A' ) FROM DUAL
C. SELECT NULLIF(100, 100) FROM DUAL
D. SELECT COALESCE(100, NULL, 200) FROM DUAL
E. SELECT NULLIF(100, 'A') FROM DUAL

Answer: A,B,C,D

Explanation:
The NULLIF and COALESCE functions in Oracle SQL serve specific purposes:
* Option A: Executes successfully. NULLIF returns NULL if the two arguments are equal; otherwise, it
* returns the first argument.
* Option B: Also correct. COALESCE returns the first non-null value among its arguments.
* Option C: This will not execute successfully because NULLIF requires both arguments to be of comparable data types. Comparing an integer to a character ('100' to 'A') is invalid.
* Option D: Executes successfully. NULLIF returns NULL because it compares NULL to a number, which is valid (though always yields NULL).
* Option E: Executes successfully. COALESCE accepts any data type as it returns the first non-null value, irrespective of type consistency among the arguments.

NEW QUESTION # 191
......

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