數(shù)據(jù)設(shè)計外文翻譯-其他專業(yè)-wenkub.com
2025-01-15 12:00 本頁面
【正文】 這允許 你從一個新鮮的角度接近事物的分析。 理解應(yīng)用任務(wù)意味著遠(yuǎn)遠(yuǎn)高于識別數(shù)據(jù)元素，使之標(biāo)準(zhǔn)化，創(chuàng)建屏幕，處理數(shù)據(jù)，并且匯報。 設(shè)計者允許此觀念指導(dǎo)一項應(yīng)用的分析和創(chuàng)造，而不是集中于很多年獨(dú)領(lǐng)風(fēng)騷的面向數(shù)據(jù)，就是這種努力的本性有了驚人的改變。但這是一個真正要去做的工作 的結(jié)果，還是計算機(jī)應(yīng)用設(shè)計的征兆，使用人類作為輸入設(shè)備，特別是大容量的，格式一致的（如報表），并在一個有限可變形范圍內(nèi)的數(shù)據(jù)，是昂貴和廢棄的，更別說失去人性，獲取數(shù)據(jù)的方法。然而一個困難是，他們都單獨(dú)集中于數(shù)據(jù)。 7. 理解應(yīng)用任務(wù) 在建造軟件方面經(jīng)常忽略的步驟之一就是真正理解終端用戶的任務(wù)－計算機(jī)自動化準(zhǔn)備去支持的任務(wù)。它也可使用作為完整的部分，它進(jìn)行操作的部分在以后進(jìn)行說明。 （ 3）它們能被用于劃分?jǐn)?shù)據(jù)單位為按去勸秘密的說明書。但對數(shù)據(jù)的描述將更加真實，一些真實反映由數(shù)據(jù)庫中的數(shù)據(jù)所描述，筆記上，并不能明確記載數(shù)據(jù)庫中的數(shù)據(jù)是如何被存儲及訪問路徑如何被提供。通常，我們選出一個作為主關(guān)鍵詞，并決定紀(jì)錄的位置。 有時可能不只一個屬性唯一的確定每個實體。 2. 關(guān)鍵詞 所有的屬性都描述實體的某一方面。當(dāng)一個資料對象被定義為整數(shù)類型時，所有標(biāo)準(zhǔn)的算術(shù)和邏輯運(yùn)算都要做合適的解釋。這就是我們熟知的類型。 more often, it is because the approach to design tends to be dataoriented. Frequently, these are the major question asked in the analysis: (1) What data should be captured (2) How should the data be processed (3) How should the data be reported These question expand into a series of sub question ,and include issues such as input forms, Codes, screen layouts, putations, postings, corrections, audit trails, retention, storage volumes, processing cycles, report formatting, distribution, and maintenance. there are all vitally important areas. One difficulty, however, is that they all focus solely on data. People use data, but they do tasks. One might argue that while this may be true of professional workers. Keyentry clerks really only transfer data from an input form to a keyboard。附錄 A Data Design 1. DATA TYPES AND VALUE SETS Anyone who has ever programmed a puter is accustomed to the fact that you usually have to tell the puter whether the information stored in a particular location is an integer, a real number, a character string, a Boolean va1ue, or whatever. Most puters have one electronic circuit for adding two integers and another for adding two real numbers, and, of course, addition does not make any sense at all, in general, for character strings. Because the pattern of bits in at storage location can usual1y be interpreted as any of these, the puter must be told what is intended. This specification is known as the type of the data. Identifying a data object as being of a particular type has the effect of defining an internal representation for the object. It also speci
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