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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      • access數據庫之ACCESS學習日記

      • 2018-09-08 09:32 來源:未知
      一、            ACCESS 的六種對象 
      a)      表是數據庫的基本對象,其它幾種對象都基于它而產生. 
      b)      查詢: 可以按照索引查找需要的記錄;  可以按要求篩選記錄;   連接若干字段組成新表. 
      c)      窗體提供了一種方便的瀏覽,輸入及更改數據的窗口. 
      d)      報表:數據分類匯總,打印. 
      e)      宏:相當于批處理,執行一系列操作 
      f)        模塊:功能與宏相似,只是更加精細,編程. 
      二、            六種對象,三種類型 
      a)      表和查詢: 數據的來源和基礎 
      b)      窗體和報表:用于顯示和打印 
      c)      宏和模塊:主要用于控制. 
      d)      補充:通過數據訪問頁訪問數據(一種網頁) 

      a)      表的概念:
                               i.              表的屬性; 表的記錄; 表的分量;  
                             ii.              對記錄的操作: 投影和選擇;
                            iii.               表與表之間可以建立連接;
      b)      表的設計原則
                               i.              表的功能要單一;(符合范式)
                             ii.              字段唯一;
                            iii.              記錄唯一性(不存在完全一樣的記錄)
                           iv.              功能相關性(不包含無關屬性)
                             v.              字段無關性:對某一字段的修改不應該影響其它字段的數據(解決辦法通常是分割表)
      c)      創建數據庫(通過模板; 使用向導創建表; 用表設計器創建表;) 
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