[問題] 關於資料庫中ER圖轉關聯的疑問？:Realtime－2016韓劇推薦排行榜 , 2016韓劇推薦好看的 , 2016韓劇推薦必看 , 2016韓劇 , 2016韓劇排行榜前十名 , 韓劇推薦 ,

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[問題] 關於資料庫中ER圖轉關聯的疑問？

Jul 26th 2014, 15:29, by zhenkun

作者zhenkun (zhenkun)

看板Examination

標題[問題] 關於資料庫中ER圖轉關聯的疑問？

時間Sat Jul 26 15:29:43 2014

將ER圖轉成關聯時，關於二元一對一有下面三種情況 1. 一端全部參與，一端部分參與 2. 二端都是全部參與 3. 二端都是部分參與關於2跟3的情況下，我有聽過二種解法，分別如下 2的情況 (1) 資料少的為主，資料多的當外鍵 (2) 合併成一個關聯 3的情況 (1) 資料少的一端為主，資料多的一端當外鍵 (2) 新增一個關聯哪一種解法才是對的啊??困惑中... -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 36.237.144.159 ※ 文章網址: http://www.ptt.cc/bbs/Examination/M.1406359785.A.A75.html

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