31 下列 SQL 語法何者錯誤?
A select count(*) from students
B select MAX(age) from students
C select name, MAX(age) from students
D select name, MAX(age) from students group by name
ANS:(C)
雖然C查出來的結果怪怪的 但應該不至於出錯吧@@
35.
④若以hT
表示生成樹TG之高度(Height),則log2(節點數)<=ht<=節點數
我覺得這句沒錯阿
不是都應該大於LOG(節點數加1嗎)@@
感謝大大們解惑~~
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A select count(*) from students
B select MAX(age) from students
C select name, MAX(age) from students
D select name, MAX(age) from students group by name
ANS:(C)
雖然C查出來的結果怪怪的 但應該不至於出錯吧@@
35.
④若以hT
表示生成樹TG之高度(Height),則log2(節點數)<=ht<=節點數
我覺得這句沒錯阿
不是都應該大於LOG(節點數加1嗎)@@
感謝大大們解惑~~
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