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Oracle Database SQL Sample Questions (Q184-Q189):

NEW QUESTION # 184
View the Exhibit and examine the structure of the PRODUCTS table. (Choose the best answer.)

You must display the category with the maximum number of items.
You issue this query:
SQL > SELECT COUNT(*), prod_category_id
FROM products
GROUP BY prod_category_id
HAVING COUNT(*) = (SELECT MAX(COUNT(*)) FROM porducts);
What is the result?

A. It executes successfully but does not give the correct output.
B. It generates an error because = is not valid and should be replaced by the IN operator.
C. It executes successfully and gives the correct output.
D. It generate an error because the subquery does not have a GROUP BY clause.

Answer: D

NEW QUESTION # 185
Examine this SQL statement:

Which two are true?

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

Answer: B,E

Explanation:
The provided SQL statement is an update statement that involves a subquery which is correlated to the main query.
A . The subquery is executed before the UPDATE statement is executed. (Incorrect) This statement is not accurate in the context of correlated subqueries. A correlated subquery is one where the subquery depends on values from the outer query. In this case, the subquery is executed once for each row that is potentially updated by the outer UPDATE statement because it references a column from the outer query (o.customer_id).
B . All existing rows in the ORDERS table are updated. (Incorrect)
Without a WHERE clause in the outer UPDATE statement, this would typically be true. However, the correctness of this statement depends on the actual data and presence of matching customer_id values in both tables. If there are rows in the ORDERS table with customer_id values that do not exist in the CUSTOMERS table, those rows will not be updated.
C . The subquery is executed for every updated row in the ORDERS table. (Correct) Because the subquery is correlated (references o.customer_id from the outer query), it must be executed for each row to be updated in the ORDERS table to get the corresponding cust_last_name from the CUSTOMERS table.
Reference:
D . The UPDATE statement executes successfully even if the subquery selects multiple rows. (Incorrect) The subquery inside the SET clause must return exactly one value for each row to be updated. If the subquery returns more than one row for any outer row, the UPDATE statement will result in an error (specifically, an "ORA-01427: single-row subquery returns more than one row" error).
E . The subquery is not a correlated subquery. (Incorrect)
This is incorrect because the subquery references the o.customer_id column from the ORDERS table, which makes it a correlated subquery.
The correct answers are A and C. The subquery is a correlated subquery because it references the ORDERS table's customer_id in its WHERE clause. It is executed for each row to be updated since it depends on values from the outer query (the o.customer_id). It's important to note that although the statement A is marked incorrect based on the typical behavior of correlated subqueries, in some cases, Oracle's optimizer may unnest the subquery and execute it beforehand if it determines that it's more efficient and the result is the same. However, this doesn't change the nature of the query being a correlated subquery.

NEW QUESTION # 186
You create a table named 123.
Which statement runs successfully?

A. SELECT * FROM '123';
B. SELECT * FROM "123";
C. SELECT * FROM V'123V';
D. SELECT * FROM TABLE (123) ;

Answer: B

Explanation:
C). True. If you have a table named 123, which is not a standard naming convention because it begins with a digit, you can reference it in SQL by using double quotation marks. The correct syntax to reference a table with a name that does not follow standard naming conventions is to enclose the name in double quotation marks.
A, B, and D are incorrect because they do not use the proper quoting mechanism for a table named with non-standard characters. In Oracle, double quotation marks are used for case-sensitive table names or those that do not follow the usual naming rules.

NEW QUESTION # 187
View the exhibit and examine the data in ORDERS_MASTERand MONTHLY_ORDERStables.

Evaluate the following MERGEstatement:
MERGE_INTO orders_master o
USING monthly_orders m
ON (o.order_id = m.order_id)
WHEN MATCHED THEN
UPDATE SET o.order_total = m.order_total
DELETE WHERE (m.order_total IS NULL)
WHEN NOT MATCHED THEN
INSERT VALUES (m.order_id, m.order_total)
What would be the outcome of the above statement?

A. The ORDERS_MASTERtable would contain the ORDER_IDs1, 2, 3 and 4.
B. The ORDERS_MASTERtable would contain the ORDER_IDs1, 2 and 4.
C. The ORDERS_MASTERtable would contain the ORDER_IDs1 and 2.
D. The ORDERS_MASTERtable would contain the ORDER_IDs1, 2 and 3.

Answer: B

Explanation:
Explanation/Reference:
References:
https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9016.htm

NEW QUESTION # 188
Examine this partial statement:

Which is true?

A. Both the query and the subquery can select only zero rows or one row.
B. The query can select only zero rows or one row, but the subquery can select any number of rows.
C. Both the query and the subquery can select any number of rows.
D. The query can select any number of rows, but the subquery can select only zero rows or one row.

Answer: B

Explanation:
Explanation/Reference: http://dcx.sybase.com/1200/en/dbusage/ug-subquery-s-4318996.html

NEW QUESTION # 189
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