調查局資訊科學 97 資料庫 問題 - 考試
By Liam
at 2016-03-05T13:44
at 2016-03-05T13:44
Table of Contents
題目如下:
http://imgur.com/dYAFTwG
以下是我的答案
http://imgur.com/HPg0sD2
不知道這樣做是否正確?
其中最有疑問的的是SHIP_AT_PORT這個關聯
他應該是指弱個體PORT_VISIT依附在PORT和SHIP的多元關聯
因此, 最後一張表格, SHIP_AT_PORT, 的候選鍵為:
1. (start_date, Pname, STATEName)
2. (start_date, Sname)
不知道這樣是否正確?
謝謝
--
http://imgur.com/dYAFTwG
以下是我的答案
http://imgur.com/HPg0sD2
不知道這樣做是否正確?
其中最有疑問的的是SHIP_AT_PORT這個關聯
他應該是指弱個體PORT_VISIT依附在PORT和SHIP的多元關聯
因此, 最後一張表格, SHIP_AT_PORT, 的候選鍵為:
1. (start_date, Pname, STATEName)
2. (start_date, Sname)
不知道這樣是否正確?
謝謝
--
Tags:
考試
All Comments
By Enid
at 2016-03-05T15:51
at 2016-03-05T15:51
By Poppy
at 2016-03-07T15:18
at 2016-03-07T15:18
By Emily
at 2016-03-10T13:39
at 2016-03-10T13:39
By Queena
at 2016-03-15T13:23
at 2016-03-15T13:23
By Andrew
at 2016-03-17T06:12
at 2016-03-17T06:12
By Kristin
at 2016-03-19T10:58
at 2016-03-19T10:58
By Irma
at 2016-03-24T08:59
at 2016-03-24T08:59
Related Posts
104年地特三等社會行政上榜分享
By Agatha
at 2016-03-05T13:10
at 2016-03-05T13:10
104地特台北市三等一般民政兼職上榜心得
By Ula
at 2016-03-05T12:10
at 2016-03-05T12:10
先行/準備行為與程序行為
By Hedy
at 2016-03-05T11:50
at 2016-03-05T11:50
101地特工數
By Audriana
at 2016-03-05T11:30
at 2016-03-05T11:30
請益有關後中國聞可有推薦字典?
By Dora
at 2016-03-05T11:04
at 2016-03-05T11:04