Overview of Relational Databases, SQL and PL/SQL Discuss the Theoretical and Physical Aspects of a Relational database E.F. Codd Fathered the concept of the Relational Datamodel. A relational model organizes DATA into TABLES and only TABLES. Tables are the lingua franca of the relational model. /-------------/ /------------------/ /------------/ / Relational /--------/ Named Attributes /-----/ Tuples / / Tables / / (Columns or / / (Rows or / /-------------/ / Fields ) / / Records) / /------------------/ /------------/ A row and column intersection is called a "cell" The columns are placeholders, having data types such as character or integer.The rows themselves are the data. A relational table must meet the following criteria: The data stored in the cells must be atomic. Each cell can only hold one pie
"...NADA SE CREA NADA SE DESTRUYE, TODO SE TRANSFORMA..." Por Wilmerbarriosjr