Data retrieval

Data retrieval

Database model introduced a programming language independent Structured Query Language "SQL" based on relational algebra.

 

"Data" and information are not synonymous. Anything stored is data but it only becomes information when it is organised and presented meaningfully. Most of the world's digital data is unstructured and stored in a variety of different physical formats within a single organisation. 

 

"Data" warehouses began to be developed in the 1980's to integrate these disparate stores.Typically contain data extracted from various sources including external sources such as Internet organised in such  way as to facilitate decision support systems.