Describe how relational databases are used in OLAP analysis, data mining, and E-commerce website applications. Solution Relational DataBase Management System used for OLTP Database Systems: OLAP with relational data base called ROLAP ROLAP works directly with relational databases management system. The base data and the dimension tables are stored as relations and new relations are created to hold the aggregated data. It depends on a specialized design schema. This methodology relies on manipulating the information stored in the relational database to give the appearance of traditional OLAP\'s slicing and dicing functionality. When Data mining use RDBMS(Relational DataBase Management System) We called Relational data mining Data mining algorithms look for patterns in information. Relational data mining (RDM) scheams are based on inductive logic programming , find patterns that involve relation tables from a relational database. Ecommerce entrepreneurs: It use relational databases work business decisions Selecting shopping cart software and hiring one web developer over another..