The Relational Structure
The relational structure is the most commonly used today. It is used by mainframe, midrange and microcomputer systems. It uses two-dimensional rows and columns to store data. The tables of records can be connected by common key values. While working for IBM, E.F. Codd designed this structure in 1972.The model is not easy for the end user to run queries with because it may require a complex combination of many tables
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