A.select * from authors where au_id =”72_-%”
B.select au_id=72_-% from authors
C.select * from authors where au_id like “72*-%”
D.select * from authors where au_id like “72_-%” _代表任意一個字符
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A. select * from authors where au_name=”d”
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A. select au_id from authors where price IN($15,:$20);
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C. select au_id from authors where price not between $15 and $20
D. select au_id from authors where price not IN($15,$20);
A. select au_id from authors where state IN(“ac”,:”sk”);
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D. select au_id from authors where state IN(“ca”,:”ks”);
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最新試題
參數(shù)的取名可以與數(shù)據(jù)表的列名相同。
MySQL變量可分為兩大類,即()
在以下選項中哪些屬于視圖的特點()
存儲過程一經(jīng)定義,就可以被反復調(diào)用,從而實現(xiàn)了代碼的復用性、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’來收回對所有數(shù)據(jù)庫的所有權(quán)限。
MySQL數(shù)據(jù)庫中,通常將用戶寫入對應的權(quán)限表來控制訪問權(quán)限的,以下屬于用戶權(quán)限得選項()
批量記錄插入,可以不要求插入數(shù)據(jù)結(jié)構(gòu)匹配,與約束不沖突。
在SQL中,刪除操作有drop、truncate、delete,其中風險等級最高的是delete。
在實際應用中,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來創(chuàng)建新視圖。
下列關(guān)于用戶權(quán)限說法正確的是()