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Oracle Database SQL Sample Questions (Q210-Q215):

NEW QUESTION # 210
Examine the structure of the EMPLOYEEStable.

There is a parent/child relationship between EMPLOYEE_IDand MANAGER_ID.
You want to display the last names and manager IDs of employees who work for the same manager as the employee whose EMPLOYEE_IDis 123.
Which query provides the correct output?
SELECT e.last_name, m.manager_id

A. FROM employees e RIGHT OUTER JOIN employees m
on (e.employee_id = m.employee_id)
WHERE e.employee_id = 123;
SELECT m.last_name, e.manager_id

B. FROM employees e LEFT OUTER JOIN employees m
on (e.employee_id = m.manager_id)
WHERE e.employee_id = 123;
SELECT e.last_name, e.manager_id

C. FROM employees e LEFT OUTER JOIN employees m
on (e.manager_id = m.manager_id)
WHERE e.employee_id = 123;

D. FROM employees e RIGHT OUTER JOIN employees m
on (e.manager_id = m.employee_id)
AND e.employee_id = 123;
SELECT e.last_name, m.manager_id

Answer: C

NEW QUESTION # 211
Which two statements are true about Data Manipulation Language (DML) statements? (Choose two.)

A. An INSERT INTO...VALUES.. statement can add multiple rows per execution to a table.

B. A DELETE FROM..... statement can remove rows based on only a single condition on a table.

C. An INSERT INTO... VALUES..... statement can add a single row based on multiple conditions on a table.

D. A DELETE FROM..... statement can remove multiple rows based on multiple conditions on a table.

E. An UPDATE... SET... statement can modify multiple rows based on multiple conditions on a table.

F. An UPDATE....SET.... statement can modify multiple rows based on only a single condition on a table.

Answer: D,E

Explanation:
Explanation
http://www.techonthenet.com/sql/and_or.php

NEW QUESTION # 212
Which two tasks require subqueries?

A. Display products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products, and whose status is orderable.

B. Display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE.

C. Display the minimum PROD_LIST_PRICE for each product status.

D. Display the total number of products supplied by supplier 102 which have a product status of obsolete.

E. Display suppliers whose PROD_LIST_PRICE is less than 1000.

Answer: A,B

Explanation:
C: True. To display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE, you would need to use a subquery to first calculate the average PROD_LIST_PRICE and then use that result to compare each product's list price to the average.
E: True. Displaying products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products and whose status is orderable would require a subquery. The subquery would be used to determine the average PROD_LIST_PRICE, and then this average would be used in the outer query to filter the products accordingly.
Subqueries are necessary when the computation of a value relies on an aggregate or a result that must be obtained separately from the main query, and cannot be derived in a single level of query execution.
References:Oracle's SQL documentation provides guidelines for using subqueries in scenarios where an inner query's result is needed to complete the processing of an outer query.

NEW QUESTION # 213
Which two statements are true about Oracle databases and SQL?

A. When you execute an UPDATE statement, the database instance locks each updated row.

B. A user can be the owner of multiple schemas In the same database.

C. Updates performed by a database user can be rolled back by another user by using the ROLLBACK command.

D. The database guarantees read consistency at select level on user-created tablers.

E. A query can access only tables within the same schema.

Answer: A,D

NEW QUESTION # 214
Which two statements are true regarding the UNION ALL operators?

A. The number of columns selected in each SELECT statement must be identical

B. Duplicates are eliminated automatically by the UNION ALL operator

C. The output is sorted by the UNION ALL operator.

D. NULLS are not ignored during duplicate checking.

E. The names of columns selected in each SELECT statement must be identical.

Answer: A,D

NEW QUESTION # 215
......

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