(1)關聯式資料庫中，資料表層次的權限設定不包含下列何者
(A)ALTER (B)Create (C) delete (D)index
老師答案給B，為什麼?
不是alter.drop.create嗎
(2)
company X shipped 5 computer chips, 1 of which was defective,and company Y
shipped 4 computer chips, 2 of which were defective. one computer chip is to
be chosen uniformly at random from the 9 chips shipped by the companies.
if the chosen ship is found to be defective,what is the probability that the
chip came from company Y?
(A)2/9 (b)4/9 (c)1/2 (d)2/3 (e)5/7
答案是(2/4)/(1/5+2/4)=5/7
不懂為什麼上面是除2/4，不是除1
(3)
----------------------
|tag | block | offect|
|---------------------
請問快取的這東西怎麼看阿..還有4-way表示法，
翻課本講義都沒看到..真的不懂抱歉..
(4)十進制的39用8,4,-2,-1表示法來表示為多少?
老師給0111 1111，但這樣會變19對吧?
抱歉問題有點多，還有謝謝
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