Certification Questions

Q:

Foreign key in DBMS is

Answer

Foreign keys are the columns of a table that points to the primary key of another table. They act as a cross-reference between tables.


 


In detail : A Foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table. In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table.

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Q:

Which of the following is a comparison operator in SQL?

A) LIKE B) BETWEEN
C) = D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

LIKE, BETWEEN and = operators are used for comparison in SQL. Comparison operators test whether two expressions are the same. Comparison operators can be used on all expressions except expressions of the text, ntext, or image data types.

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Q:

Why that you cannot overload the scope resolution operator (::) ?

Answer

The main reason why the (::) cannot be overloaded is that only operators that take in values as parameters can be overloaded. The scope resolution operator does not take a value as parameter.

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Q:

What is plug and play ?

Answer

Plug and Play is a technology wherein hardware components that are installed on PC's using Microsoft operating system are immediately recognized and made usable. This means that the drivers necessary to make it work are already available in the operating system package.

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Q:

Which packages contain the JDBC classes?

A) java.sql B) java.sl
C) java.jd D) java.jdbc
 
Answer & Explanation Answer: A) java.sql

Explanation:

The Java packages which contain JDBC classes and interfaces is Java.SQL.

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Q:

Which entity owns ITIL now?

Answer

ITIL (Information Technology Infrastructure Library) is owned by Axelos since, 2013.

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