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Welcome to your Java Practice Test - 6

A UNION query is which of the following?

A. Combines the output from no more than two queries and must include the same number of columns.

B. Combines the output from no more than two queries and does not include the same number of columns.

C. Combines the output from multiple queries and must include the same number of columns.

D. Combines the output from multiple queries and does not include the same number of columns.

A table is in 3NF if it is in 2NF and if it has no ____________

a) Functional Dependencies

b) Transitive Dependencies

c) Trivial Functional Dependency

d) Multivalued Dependencies

Which of the following statements is true concerning subqueries?

A. Involves the use of an inner and outer query.

B. Cannot return the same result as a query that is not a subquery.

C. Does not start with the word SELECT.

D. All of the above.

What is the type of Oracle backup in which all uncommitted changes have been removed from the datafiles?

A. Inconsistent backup

B. Consistent backup

C. Full backup

D. Differential backup

The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;

A. Equi-join

B. Natural join

C. Outer join

D. Cartesian join

A ________ is a stored program that is attached to a table or a view.

A. pseudofile

B. embedded SELECT statement

C. trigger

D. None of the above is correct.

Embedded SQL is which of the following?

A. Hard-coded SQL statements in a program language such as Java.

B. The process of making an application capable of generating specific SQL code on the fly

C. Hard-coded SQL statements in a procedure.

D. Hard-coded SQL statements in a trigger.

Which of the following is a correlated subquery?

A. Uses the result of an inner query to determine the processing of an outer query.

B. Uses the result of an outer query to determine the processing of an inner query.

C. Uses the result of an inner query to determine the processing of an inner query.

D. Uses the result of an outer query to determine the processing of an outer query.

Which of the following is true concerning triggers?

A. You do not create them with SQL.

B. They execute against only some applications that access a database.

C. They have an event, condition, and action.

D. They cannot cascade (cause another trigger to fire).

How many tables may be included with a join?

A. One

B. Two

C .Three

D. All of the above.

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