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Oracle Database SQL Sample Questions (Q12-Q17):

NEW QUESTION # 12
Examine the description of the EMPLOYEES table:

Which statement will execute successfully, returning distinct employees with non-null first names?

A. SELECT DISTINCT * FROM employees WHERE first_ name IS NOT NULL;
B. SELECT first_ name, DISTINCT last_ name FROM employees WHERE first_ name < > NULL;
C. SELECT first_ name, DISTNCT last_ name FROM employees WHERE first_ name IS NOT NULL;
D. SELECT Distinct * FROM employees WHERE first_ name < > NULL;

Answer: A

NEW QUESTION # 13
Which three are true about the MERGEstatement? (Choose three.)

A. It can use views to produce source rows.
B. It can use subqueries to produce source rows.
C. It can update, insert, or delete rows conditionally in multiple tables.
D. It can combine rows from multiple tables conditionally to insert into a single table.
E. It can merge rows only from tables.
F. It can update the same row of the target table multiple times.

Answer: A,B,C

Explanation:
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-merge/

NEW QUESTION # 14
Examine the data in the INVOICES table:

Examine the data in the CURRENCIES table:
CURRENCY_CODE
-------------
JPY
GPB
CAD
EUR
USD
Which query returns the currencies in CURRENCIES that are not present in INVOICES?

A. SELECT currency_ code FROM currencies
INTERSECT
SELECT currency_ code FROM invoices;
B. SELECT * FROM currencies
MINUS
SELECT * FROM invoices;
C. SELECT * FROM currencies
WHERE NOT EXISTS (
SELECT NULL FROM invoices WHERE currency_ code = currency_ code);
D. SELECT currency_ code FROM currencies
MINUS
SELECT currency_ code FROM invoices;

Answer: D

Explanation:
To calculate the length of employment, you would compare the current date to the HIRE_DATE and calculate the difference in years.
A). This is the correct answer. The expression calculates the number of days between the current date (SYSDATE) and the HIRE_DATE, then divides by 365 to convert it to years, and checks if it is greater than 5.
B). SYSTIMESTAMP includes a time component including fractional seconds and time zone information, making this comparison incorrect.
C). There are typos in this option (CUARENT_DATE should be CURRENT_DATE and hire_data should be hire_date). Even with the correct function and column names, CURRENT_DATE returns the current date in the session time zone, not in years.
D). There are typos in this option (SYSNAYW should be SYSDATE). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
E). This is a repetition of option D with the same issues.
F). There are typos in this option (CUNACV_DATE should be CURRENT_DATE and hire_data should be hire_date). Additionally, dividing by 12 incorrectly assumes that a month is equivalent to a year.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Date Functions"

NEW QUESTION # 15
View and Exhibit and examine the structure and data in the INVOICE table. (Choose two.)

Which two statements are true regarding data type conversion in query expressions?

A. inv_no BETWEEN '101' AND '110' : uses implicit conversion
B. inv_date = '15-february-2008' :uses implicit conversion
C. inv_date > '01-02-2008' : uses implicit conversion
D. CONCAT(inv_amt, inv_date) : requires explicit conversion
E. inv_amt = '0255982' : requires explicit conversion

Answer: A,B

NEW QUESTION # 16
Which statements are true regarding primary and foreign key constraints and the effect they can have on table data?

A. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted.
B. It is possible for child rows that have a foreign key to remain in the child table at the time the parent row is deleted.
C. The foreign key columns and parent table primary key columns must have the same names.
D. Primary key and foreign key constraints can be defined at both the column and table level.
E. A table can have only one primary key and one foreign key.
F. Only the primary key can be defined the column and table level.
G. A table can have only one primary key but multiple foreign keys.

Answer: A,D,G

Explanation:
Regarding primary and foreign key constraints:
A . A table can have only one primary key but multiple foreign keys. This is true. A table is constrained to have only one primary key, which can consist of multiple columns, but can have several foreign keys referencing primary keys in other tables.
C . Primary key and foreign key constraints can be defined at both the column and table level. True. Constraints can be defined inline with the column definition or separately at the end of the table definition.
E . It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted. This is also true if the foreign key is defined with the ON DELETE CASCADE option.
Options B, D, F, and G are incorrect:
B is incorrect because if a parent row is deleted, the child rows cannot remain without violating the integrity unless the foreign key is defined with ON DELETE SET NULL or similar behavior.
D is incorrect because both primary and foreign key constraints can be defined at both levels.
F is incorrect as the names of the foreign key columns do not need to match the primary key column names.
G is incorrect as a table can have multiple foreign keys.

NEW QUESTION # 17
......

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