In the 1970s , the rigorous mathematical work of e . f . codd and others created the now - ubiquitous relational database model 70年代, e . f . codd與其他一些人通過(guò)嚴(yán)格的數(shù)學(xué)工作創(chuàng)造了現(xiàn)在無(wú)處不在的關(guān)系數(shù)據(jù)庫(kù)模型。
1 codd e f . providing olap on - line analytical processing touser - analysts : an it mandate . technical report , e . f . codd andassociates , 1993 文獻(xiàn)3利用前綴和技術(shù)提出了單機(jī)環(huán)境下多維數(shù)據(jù)集合的輔助存儲(chǔ)結(jié)構(gòu)prefix cube簡(jiǎn)稱pc 。
According to new scientist , steve perry and jonathan codd from the university of bonn said sauropods , which reached 40 metres and weighed 100 tonnes ( 10 times as much as the largest elephants ) sucked in air more efficiently than mammals today 根據(jù)新科學(xué)家雜志,柏恩大學(xué)的史提夫裴利與強(qiáng)納森考德表示, 40公尺, 100噸(最大型大象的10倍)的龍腳類恐龍,以比今日哺乳類更有效率的方式吸入空氣。