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| RDBMS |
Combine separate files related (tables) of a series is maintained, but the elements of database queries and reports, data files, if necessary. concept Edgar Codd in 1970, was selected for a user to adapt to ad hoc data. The majority of companies in the management system database (DBMS), Oracle, DB2, SQL Server, MySQL, etc., related to a DBMS (RDBMS) is (see DBMS), including. Applications of modern databases and commercial open-source relational in nature. The main features of relational database tables to store data in a way that can be used, and maintain, however, some data Relationships.
Universal report: -
The report is, essentially, a universal condition, and he said It is possible, a large table, while the data store. In a sense, a universal relation, "before" fully normalized relational schema. It is also assumed that the semantic attributes of the various reports in the same way. As a result, many Columns can be NULL. But the thought experiment, which is perfectly fine.
Associations: -
Interviews in some local or remote communities are usually instances of SQL CONNECT, the display server. The current MIB does not reveal there are individual companies, the union and the board of Apple dbmsSvrInfoTable counters. There are also connections between servers and databases. obvious Possible relations and media.
. A database: 1 Server
. A database: the number of servers
. Many database: 1 Server
. Many database server
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