Short Question Answers Q What do you mean by data dictionary ? A  A data dictionary is a file that contains "meta data" i.e data about data.   Q What are the main classification of SQL statements ?  A SQL commands are classifieds as follows Data Defination Language (DDL) - allows you to perform tasks related to data defination eg CREATE, ALTER, DROP   Data Manipulation Langugae (DML)- enables users to access or manipulate data as organized .... বিস্তারিত এখানে

Short Question Answers  Q What is Data mining ? A Data mining is  knowledge discovery in databases. It is  extraction of interesting (non-trivial, implicit, previously unknown and potentially useful) information or patterns from data in large databases.   Q What is difference between OLAP and data mining ? A  OLAP - (On-line Analytical Processing )provides you with a very good view of what is happening, but can not predict what will happen in the future or why it is hap .... বিস্তারিত এখানে

Short  Question Answers   Q What is the main purposes of an operating system ?   A  The main purpose of an operating system is to :- To provide an environment for a computer user to execute  on computer hardware in a convenient and efficient manner. To allocate the separate resources of the computer as needed to solve the problem given. The allocation process should be as fair and efficient as possible. Q What is the purpose of sys .... বিস্তারিত এখানে

Decimal Numbering System The decimal numbering system has 10 digits 0 through 9 ​ The decimal numbering system has a base of 10 with each position weighted by a factor of 10 like ….105 104 103 102 101 100. 10-1 10-2 10-3 10-4 10-5… eg 14.2 = 1 X 101 + 4 X 100 + 2 X 10-1   Binary Numbers The binary numbering system has 2 digits; 0 and 1   The binary numbering system has a base of 2 with each position weighted by a factor of 2 like  ….25 24 .... বিস্তারিত এখানে

What is a system software? It consists of variety of programs that supports the operation of the computer. This software makes it possible for the user to focus on the other problems to be solved with out needing to know how the machine works internally. Eg: operatirig system, assembler, loader. What is a compiler and interpreter? Comiler is a set of program which converts the whole high level language program to machine language program. Interpreter .... বিস্তারিত এখানে

What is piggybacking ? Piggybacking on Internet access is the practice of establishing a wireless Internet connection by using another subscriber's wireless Internet access service without the subscriber's explicit permission or knowledge. It is a legally and ethically controversial practice, with laws that vary by jurisdiction around the world. While completely outlawed or regulated in some places, it is permitted in others.   Name the two sub layers of Data .... বিস্তারিত এখানে