98高考資料處理 - 高考
By Irma
at 2013-06-21T19:44
at 2013-06-21T19:44
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
題目:
因為有資料表,故用網址連結
http://ppt.cc/Xvkd 中的第五題
想法:
因為補習班的解答是 πname,city(σbookname='紅樓夢'(Bookstores |X| Order
|X| Books))
請問要不要加合併條件??
後面寫成(Bookstores |X|Bookstores.no=Order.no Order |X|Order.id=Books.id
Books)
??
請高手替我回答,謝謝
--
題目:
因為有資料表,故用網址連結
http://ppt.cc/Xvkd 中的第五題
想法:
因為補習班的解答是 πname,city(σbookname='紅樓夢'(Bookstores |X| Order
|X| Books))
請問要不要加合併條件??
後面寫成(Bookstores |X|Bookstores.no=Order.no Order |X|Order.id=Books.id
Books)
??
請高手替我回答,謝謝
--
Tags:
高考
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