翻訳と辞書 Words near each other ・ rehi ・ reid, brian ・ reify ・ reincarnation, cycle of ・ reinvent the wheel ・ rel english ・ relation ・ relational algebra ・ relational calculus ・ relational data model ・ relational database ・ relational database management system ・ relational dbms ・ relational language ・ relational model ・ relative ・ relative pathname ・ relative record data set ・ relatively prime ・ relcode Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク relational database ： FOLDOC 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_co スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.