This paper aims at describing some techniques for manipulating data stored in databases. At first, it is important to describe the main features of a network, their classification, the client - server concept, and the data manipulation language. The paper is divided into two parts: the first...

The paper describes the concept of Data Mining and its origin.. Data mining is a process of analyzing data in order to find hidden useful and understandable relationship for the data user. Furthermore, we mention the main areas that are likely to produce data sources, classification criteria of...