Explain the relational database data model
What will be an ideal response?
Answer: A data model is an abstract representation of the contents of a database. The majority of new DMBS use what is called the relational data model, developed by Dr. E. F. Codd in 1970. Using this model, everything in the database is stored in the form of tables, known as relations. Keep in mind that this is the conceptual- and external-level schemas (which describes the logical structure of a database), not the actual physical structure of the database itself. In the concept of relations, both rows and columns comprise the database tables. Each row in a relation (table) is called a tuple. Tuples contain data about a specific occurrence of the type of entity represented by that table. For example, in a sales table, each tuple may contain all of the information about a specific customer. Each column in a relation contains information about one specific attribute of that entity. Using the sales example again, the columns in such a table may represent specific characteristics about each sales transaction.
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