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Q:

What is the difference between throw and throws clause?

Answer

A throw is used to throw an exception manually, where as throws is used in the case of checked exceptions, to tell the compiler that we haven't  handled the exception, so that the exception will be handled by the calling function.

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Subject: Java

Q:

If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

A) First normal form B) Second normal form
C) Third normal form D) Fourth normal form
 
Answer & Explanation Answer: B) Second normal form

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Filed Under: Database

Q:

________ is an open source DBMS product that runs on UNIX, Linux and Windows.

A) MySQL B) JSP/SQL
C) JDBC/SQL D) Sun ACCESS
 
Answer & Explanation Answer: A) MySQL

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Q:

 ________ is a simple object model that is easier to understand and use than OLE DB, and is frequently used for database applications.

A) ASP B) XML
C) ODBC D) ADO
 
Answer & Explanation Answer: D) ADO

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Filed Under: Database

Q:

Of the three ways to create an Oracle database, which one is the easiest and most recommended?

A) Using the Oracle Database Configuration Assistant. B) Using the Oracle-supplied database creation procedures.
C) Using the SQL CREATE DATABASE command. D) None of the above is correct.
 
Answer & Explanation Answer: A) Using the Oracle Database Configuration Assistant.

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Q:

 What SQL command will allow you to change the table STUDENT to add the constraint named GradeCheck that states that the values of the Grade column must be greater than 0?

A) ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0); B) ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);
C) ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0); D) None of the above is correct.
 
Answer & Explanation Answer: C) ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);

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Q:

 The process of reading a database schema and producing a data model from that schema is known as:

A) data modeling. B) database design.
C) reverse engineering. D) None of the above is correct.
 
Answer & Explanation Answer: C) reverse engineering.

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Q:

 If a table has been normalized so that all determinants are candidate keys, then that table is in:

A) 1NF B) 2NF
C) 3NF D) BCNF
 
Answer & Explanation Answer: D) BCNF

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Filed Under: Database