Can you define The relational structure of a database?

Is there anyone out there who can help me with the database relational structure?
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"A database is an application that can store and retrieve data very rapidly. The relational bit refers to how the data is stored in the database and how it is organized. When we talk about database, we mean a relational database, in fact an RDBMS - Relational Database Management System. "
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"inside a relational database, almost all data is trapped in kitchen tables. Most of these have the identical composition repeated with every single row (being a spread sheet) and it's also the actual associations between your platforms which render it A ""relational"" stand. Previous to Relational Listings: Just before relational data source were invented (inside seventies), other styles regarding data source such as hierarchical sources were used. Nevertheless relational sources are very successful intended for companies like Seer, Sun microsystems and Microsoft. Outdoors resource human race boasts RDBMS"
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"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 1970. The model is not easy for the end user to run queries with because it may require a complex combination of many tables. Source:"
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