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Oracle Database SQL Sample Questions (Q161-Q166):

NEW QUESTION # 161
See the Exhibit and examine the structure of the PROMOTIONS table:
Using the PROMOTIONS table,
you need to find out the average cost for all promos in the range $0-2000 and $2000-5000 in category A.
You issue the following SQL statements:
What would be the outcome?

A. It generates an error because multiple conditions cannot be specified for the WHEN clause.
B. It generates an error because CASE cannot be used with group functions.
C. It executes successfully and gives the required result.
D. It generates an error because NULL cannot be specified as a return value.

Answer: C

Explanation:
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END

NEW QUESTION # 162
Which two statements are true about dropping views?

A. Read only views cannot be dropped.
B. Views referencing a dropped view become invalid.
C. The creator of a view to be dropped must have the drop any view privilege.
D. CASCADE CONSTRAINTS must be specified when referential integrity constraints on other objects refer to primary or unique keys in the view to be dropped.
E. Data selected by a view's defining query is deleted from its underlying tables when the view is dropped.

Answer: B,C

NEW QUESTION # 163
Which two tasks require subqueries?

A. Display suppliers whose PROD_LIST_PRICE is less than 1000.
B. Display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE.
C. Display the total number of products supplied by supplier 102 which have a product status of obsolete.
D. Display products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products, and whose status is orderable.
E. Display the minimum PROD_LIST_PRICE for each product status.

Answer: B,D

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 # 164
Examine the description of the EMPLOYEEStable:

Which two statements will run successfully? (Choose two.)

A. SELECT 'The first_name is ''' || first_name || ''' FROM employees;
B. SELECT 'The first_name is ' || first_name || '' FROM employees;
C. SELECT 'The first_name is '' || first_name || '' FROM employees;
D. SELECT 'The first_name is ''' || first_name || '''' FROM employees;
E. SELECT 'The first_name is '' || first_name || ''' FROM employees;

Answer: B

NEW QUESTION # 165
Examine the data in the EMPLOYEES table:

Which statement will compute the total annual compensation for each employee?

A. SELECT last_ name, monthly_ salary*12) + (monthly_ salary * 12 * Monthly commission _Pct) AS
annual_ comp
FROM employees;
B. SELECT last name, (monthly_ salary *12) + (monthly_ salary * 12 * NVL
(monthly commission pct,0) ) As annual _ comp
FROM employees;
C. SELECT last_ name (monthly_ salary+ monthly_ commission _ pct) *12 AS annual_
FROM employees ;
D. SELECT last name,
(monthly salary*12) + (monthly_commission_pct * 12) AS
annual comp
FROM employees
;

Answer: B

NEW QUESTION # 166
......

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