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Oracle Database SQL Sample Questions (Q100-Q105):

NEW QUESTION # 100
Which three statements are true regarding subqueries? (Choose three.)

A. Subqueries can contain GROUP BY and ORDER BY clauses.
B. Only one column or expression can be compared between the main query and subquery.
C. Main query and subquery can get data from different tables.
D. Multiple columns or expressions can be compared between the main query and subquery.
E. Main query and subquery must get data from the same tables.
F. Subqueries can contain ORDER BY but not the GROUP BY clause.

Answer: A,C,D

Explanation:
Explanation
http://docs.oracle.com/javadb/10.6.2.1/ref/rrefsqlj13658.html

NEW QUESTION # 101
Which three statements are true about defining relations between tables in a relational database?

A. Primary key columns allow null values.
B. Foreign key columns allow null values.
C. Every primary or unique key value must refer to a matching foreign key value.
D. Every foreign key value must refer to a matching primary or unique key value.
E. Unique key columns allow null values

Answer: B,D

Explanation:
A). Correct. Foreign key constraints can be nullable. This allows the possibility of a row not having a link to another table. B. Incorrect. Unique key constraints do not allow multiple rows to have null values unless the constraint is defined on multiple columns. C. Incorrect. Primary key columns must be NOT NULL and unique across the table. D. Incorrect. Primary or unique key values do not refer to foreign keys; it's the foreign keys that refer to primary or unique keys. E. Correct. Foreign key constraints enforce referential integrity by requiring that each foreign key value matches a primary or unique key value in the related table.
These are standard rules in relational databases, which can be confirmed in the Oracle Database Concepts Guide.

NEW QUESTION # 102
Which two statements are true about sequences created in a single instance Oracle database? (Choose two.)

A. DELETE <sequencename> would remove a sequence from the database.
B. When the MAXVALUE limit for a sequence is reached, it can be increased by using the ALTER SEQUENCE statement.
C. CURRVAL is used to refer to the most recent sequence number that has been generated for a particular sequence.
D. When a database instance shuts down abnormally, sequence numbers that have been cached but not used are available again when the instance is restarted.
E. The numbers generated by an explicitly defined sequence can only be used to insert data in one table.

Answer: B,C

Explanation:
Explanation
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm

NEW QUESTION # 103
Which three statements are true about the ALTER TABLE ----DROP COLUMN .....command?

A. A column can be dropped only if it does not contain any data.
B. A dropped column can be rolled back.
C. A column can be dropped only if another column exists in the table.
D. The column in a composite PRIMARY KEY with the CASCADE option can be dropped.
E. A parent key column in the table cannot be dropped.

Answer: B

NEW QUESTION # 104
Which two statements are true regarding the EXISTS operator used in the correlated subqueries? (Choose two.)

A. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
B. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.
C. The outer query stops evaluating the result set of the inner query when the first value is found.
D. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.

Answer: A,C

Explanation:
Explanation
References:
http://www.techonthenet.com/oracle/exists.php

NEW QUESTION # 105
......

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