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  relational database
       
           (RDBMS - relational database management system) A
          database based on the relational model developed by
          E.F. Codd.  A relational database allows the definition of
          data structures, storage and retrieval operations and
          integrity constraints.  In such a database the data and
          relations between them are organised in tables.  A table is
          a collection of rows or records and each row in a table
          contains the same fields.  Certain fields may be designated
          as keys, which means that searches for specific values of
          that field will use indexing to speed them up.
       
          Where fields in two different tables take values from the same
          set, a join operation can be performed to select related
          records in the two tables by matching values in those fields.
          Often, but not always, the fields will have the same name in
          both tables.  For example, an "orders" table might contain
          (customer_id, product_code) pairs and a "products" table might
          contain (product_code, price) pairs so to calculate a given
          customer's bill you would sum the prices of all products
          ordered by that customer by joining on the product-code fields
          of the two tables.  This can be extended to joining multiple
          tables on multiple fields.  Because these relationships are
          only specified at retreival time, relational databases are
          classed as dynamic database management system.
       
          The first commercial RDBMS was the Multics Relational Data
          Store, first sold in 1978.
       
          INGRES, Oracle, Sybase, Inc., Microsoft Access, and
          Microsoft SQL Server are well-known database products and
          companies.  Others include PostgreSQL, SQL/DS, and RDB.
       
          ["Managing Data Bases, Four Critical Factors" Michael
          M. Gorman, QED Information Sciences, Inc.].
       
          ["An Introduction To Database Systems" (6th ed) C. J. Date,
          Addison Wesley (an excellent source of detailed info)].
       
          ["An End-User's Guide to Data Base" James Martin, Prentice
          Hall (excellent place to begin learning about DBMS)].
       
          (2002-06-10)
       
       

  relational database
       n : a database in which relations between information items are
           explicitly specified as accessible attributes; "in a
           relational database the data are organized as a number of
           differently sized tables"

  relational database
     n.
     (lb en databases) A database consisting of separate tables, having
  explicitly defined relationships, and whose elements may be selectively
  combined as the results of query.

  relational database
     n.
     (lb en databases) A database consisting of separate tables, having
  explicitly defined relationships, and whose elements may be selectively
  combined as the results of query.

  relational database
     n.
     (lb en databases) A database consisting of separate tables, having
  explicitly defined relationships, and whose elements may be selectively
  combined as the results of query.

  relational database
     n.
     (lb en databases) A database consisting of separate tables, having
  explicitly defined relationships, and whose elements may be selectively
  combined as the results of query.

  relational database /ɹɪlˈeɪʃənəl dˈeɪtəbˌeɪs/ 
  релационна база данни
  relational database

  relational database /ɹɪlˈeɪʃənəl dˈeɪtəbˌeɪs/ 
   [it] relační databáze

  relational database /ɹɪlˈeɪʃənəl dˈeɪtəbˌeɪs/ 
  relaatiotietokanta
  relational database

  relational database /ɹɪlˈeɪʃənəl dˈeɪtəbˌeɪs/
  odnosna baza podataka, relacijska baza podataka