翻訳と辞書 Words near each other ・ Dual Scan ・ Dual Screen ・ Dual sector education ・ Dual segmented Langmuir probe ・ Dual Shock Wave ・ Dual SIM ・ Dual slalom ・ Dual space ・ Dual specificity phosphatase 27 (putative) ・ Dual speed focuser ・ Dual Spires ・ Dual State Monument ・ Dual superconductor model ・ Dual Survival ・ Dual system of government ・ DUAL table ・ Dual therapy stent ・ Dual topology ・ Dual total correlation ・ Dual Transfer Mode ・ Dual trigger insurance ・ Dual unionism ・ Dual Unity ・ Dual Vee Model ・ Dual wavelet ・ Dual wield ・ Dual Work Exchanger Energy Recovery ・ Dual! Parallel Trouble Adventure ・ Dual-Axis Radiographic Hydrodynamic Test Facility ・ Dual-band blade antenna 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 DUAL table ： ウィキペディア英語版 DUAL table The DUAL table is a special one-row, one-column table present by default in Oracle and other database installations. In Oracle, the table has a single VARCHAR2(1) column called DUMMY that has a value of 'X'. It is suitable for use in selecting a pseudo column such as SYSDATE or USER. ==Example use== Oracle's SQL syntax requires the FROM clause but some queries don't require any tables - DUAL can be readily used in these cases. SELECT 1+1 FROM DUAL; SELECT 1 FROM DUAL; SELECT USER FROM DUAL; SELECT SYSDATE FROM DUAL; SELECT * FROM DUAL; 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DUAL table」の詳細全文を読む 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.