A.AND
B.NOT
C.OR
D.XOR
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A.Select * from [order details] Order by quantity desc
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A.SELECT * FROM Products WHERE UnitPrice >= 20 OR UnitPrice <= 40
B.SELECT * FROM Products WHERE UnitPrice BETWEEN 20 OR 40
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D.SELECT * FROM Products WHERE UnitPrice BETWEEN 20 AND 40
A.SELECT Product Name AS’產(chǎn)品的名稱’,Unit Price AS’單價(jià)’FROM Products
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最新試題
在以下選項(xiàng)中哪些屬于視圖的功能()
存儲(chǔ)過程一經(jīng)定義,就可以被反復(fù)調(diào)用,從而實(shí)現(xiàn)了代碼的復(fù)用性、封裝性、高性能等。
在MySQL中如果權(quán)限授予不合理,可以通過EVOKE ALL PRIVILEGES ON *.*FROM’username’@’localhost’來(lái)收回對(duì)所有數(shù)據(jù)庫(kù)的所有權(quán)限。
在insert語(yǔ)句中可以嵌入子查詢,通過子查詢將來(lái)自其他數(shù)據(jù)表的數(shù)據(jù)批量插入到所需的數(shù)據(jù)表中。
MySQL數(shù)據(jù)庫(kù)中,通常將用戶寫入對(duì)應(yīng)的權(quán)限表來(lái)控制訪問權(quán)限的,以下屬于用戶權(quán)限得選項(xiàng)()
下列關(guān)于用戶權(quán)限說法正確的是()
MySQL通過賦予/撤銷某個(gè)用戶對(duì)某個(gè)數(shù)據(jù)庫(kù)或某個(gè)表的某項(xiàng)權(quán)力(讀、寫、更改、刪除等),來(lái)保證數(shù)據(jù)安全。
在實(shí)際應(yīng)用中,為了防止新建視圖與已存在的視圖重名產(chǎn)生沖突,常用CREATE OR REPLACE VIEW來(lái)創(chuàng)建新視圖。
在MYSQL中,存儲(chǔ)過程不可以帶有參數(shù)。
存儲(chǔ)過程命名規(guī)則與數(shù)據(jù)庫(kù)、數(shù)據(jù)表、列等標(biāo)識(shí)符命名可以隨心所欲,不需要規(guī)則一致。