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Codd produced 12rules as part of a personal campaign to prevent the vision of the original relational database from being diluted, as database vendors scrambled in the early 1980s to repackage existing products with a relational veneer. Rule 12 was particularly designed to counter such a positioning. Even if such repackaged non-relational products eventually gave way to SQL DBMSs, no popular relational DBMSs could be considered relational, be it by Codd's twelve rules or by the more formal definitions in his papers and books. Only less known DBMSs ├?┬ó?? most of them restricted to academic usage ├?┬ó?? strive to comply. The only commercial example, as of December 2010, is Dataphor. Some rules are deemed controversial, especially rule 3, because of debate on three-valued logic.

A Microprocessor, sometimes called a logic chip, is a computer processor on a microchip. It is Normally Designed on a Semi Conductor Chip like Silicon. It is also known as the processor of the Microcomputers.

Computer education in schools plays important role in students/Kids career development. Computer with the internet is the most powerful device that students can use to learn new skills and more advanced version of current lessons. Schools are around the globe teaching studentâ??s basics of computers and internet. The uses of computers and internet are growing day by day at high speed. In almost all business, companies, schools using computers for various official operations. New tech tools are coming that helping students to learn better.