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Oracle Database SQL Sample Questions (Q376-Q381):

NEW QUESTION # 376
Which three are true about subqueries?

A. <ANY returns true if the argument is less than the highest value returned by the subquery.
B. A subquery can be used in a WHERE clause.
C. A subquery cannot be used in a FROM clause.
D. < any returns true if the argument is less than the lowest value returned by the subquery.
E. A subquery can be used in a HAVING clause.
F. A subquery cannot be used in the select list.
G. =ANY can only evaluate the argument against a subcjuery if it returns two or more values.

Answer: A,B,E

Explanation:
About the roles and behavior of subqueries in SQL:
* A. A subquery can be used in a WHERE clause: Subqueries are often used in WHERE clauses to filter rows based on a condition evaluated against a set of returned values.
* B. A subquery can be used in a HAVING clause: Similar to WHERE, subqueries can be used in HAVING clauses to filter groups based on aggregate conditions.
* D. <ANY returns true if the argument is less than the highest value returned by the subquery: The <ANY (or <SOME) operator compares a value to each value returned by a subquery and returns true if the comparison is true for any one of the returned values.
Incorrect options:
* C: =ANY evaluates true if the argument matches any single value returned by the subquery, irrespective of the number of values.
* E: A subquery can indeed be used in a FROM clause, known as a derived table or inline view.
* F: <ANY returns true if the argument is less than any of the values returned by the subquery, not necessarily the lowest.
* G: A subquery can be used in a SELECT list, particularly when the subquery is designed to return a single value (scalar subquery).

NEW QUESTION # 377
You execute this command:
TRUNCATE TABLE dept;
Which two are true?

A. It retains the integrity constraints defined on the table.
B. A ROLLBACK statement can be used to retrieve the deleted data.
C. It always retains the space used by the removed rows.
D. It retains the indexes defined on the table.
E. A FLASHBACK TABLE statement can be used to retrieve the deleted data.
F. It drops any triggers defined on the table.

Answer: A,D

NEW QUESTION # 378
Examine the data in the CUSTOMERStable:

You want to list all cities that have more than one customer along with the customer details.
Evaluate the following query:

Which two JOIN options can be used in the blank in the above query to give the correct output? (Choose two.)

A. RIGHT OUTER JOIN
B. NATURAL JOIN
C. FULL OUTER JOIN
D. JOIN
E. LEFT OUTER JOIN

Answer: A,D

NEW QUESTION # 379
View the Exhibit and examine the structure of the PRODUCT table.

Which two tasks would require subqueries? (Choose two.)

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

Answer: B,D

NEW QUESTION # 380
Which is true about the & and && prefixes with substitution variables?

A. The && prefix will not prompt for a value even if the substitution variable is not previously defined in the session.
B. An & prefix to an undefined substitution variable, which is referenced twice in the same query, will prompt for a value twice .
C. An && prefix to an undefined substitution variable, which is referenced multiple times in multiple queries, will prompt for a value once per query.
D. & can prefix a substitution variable name only in queries. DML
E. Both & and && can prefix a substitution variable name in queries and DML statements.

Answer: E

Explanation:
E). True. Both & and && can prefix substitution variables in queries as well as in DML statements. & is used for defining a substitution variable that prompts the user every time the variable is encountered. && is used for a persistent substitution variable that, once defined in the session, will not prompt the user again for a value if used subsequently.

NEW QUESTION # 381
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