KNOW IT: databases, SQL, ERM, relationships, normalization

An informative, created by MacXmedia, presentation on relational databases and SQL. Also includes explanation of the entity-relationship model, relationships (Relationships), normalization of databases. - Music: 8-Bit Weapon - Times of Lore Title (Epic Hendrix Mix) - WIKIPEDIA [EN]: A relational database is used for electronic data management in computer systems and is based on the relational database model. This was proposed in 1970 by Edgar F. Codd first time and is still, despite some criticisms of an established standard for databases. The associated data base management system is called a relational database management system or RDBMS (Relational Database Management System). To query and manipulate the data mainly the database language SQL (Structured Query Language) is used. Basis of the concept of relational databases is the relation, one in the mathematical sense of well-defined concept. It represents a mathematical description of a table, see Database Relation. Operations on these routes are determined by the relational algebra. The relational algebra is thus the theoretical foundation of SQL.

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