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A relation is an assciation between two or more entities.

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15y ago

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Difference between database and database instance?

In general, a database is a collection of related data. In more specific terms, a database is typically a collection of computer files, usually stored on disk, used to contain and manage this data. The logical structure of a database (as organized in tables, indexes, views, etc.) does not necessarily correspond directly to its physical structure (the data files, transaction log files, etc.). A database instance is the instantiation of memory structures and processes by a database management system manages the logical and physical structures and the data organized and stored therein. An application program must connect to and interact with the database instance in order to insert, retrieve, modify, and/or delete data stored in the database.


What is dBase in terms of DBMS?

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What is rdbm?

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What terms refers to a system of management controlled by the least qualified members of a society?

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What is database and how is using in C?

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What is a relation in math terms?

A relation is a set of ordered pairs


When the computer work with data this is called?

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Advantages and disadvantages of relational database system?

A pivotal setup in designing a relation database is to design the relations making up the database. Although this might appear to be a simple task, many subtleties are waiting to trap the unwary designer. The Advantages to using a relational database system: You use tables to create the relation. Inside the tables are primary and alternative keys. The primary keys create the relation between the tables with the alternative keys. The disadvantage: You can lose information if the keys over lap in the requests made by the creator. Sometimes this is true and sometimes it is not. SQL is a type of database, is called structure query language. Which commonly is know to form the structure of the backbone for most relations database query systems. The popularity of this language is because the American Standard Institute standardized it. Another reason is that it was originally developed and marketed by IBM and has thus benefited from a high level of exposure.