A.數(shù)據(jù)庫對創(chuàng)建表的數(shù)量沒有限制
B.創(chuàng)建數(shù)據(jù)庫表示不能同時(shí)創(chuàng)建約束
C.創(chuàng)建數(shù)據(jù)庫表的同時(shí)創(chuàng)建主鍵,實(shí)際上是在創(chuàng)建表后對表進(jìn)行修改
D.創(chuàng)建數(shù)據(jù)庫表的同時(shí)創(chuàng)建外鍵,實(shí)際上是在創(chuàng)建表后對表進(jìn)行修改
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最新試題
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。
在MySQL中,可以使用insert語句向數(shù)據(jù)庫表插入數(shù)據(jù)記錄方式有()
在MYSQL中,存儲過程不可以帶有參數(shù)。
在SQL中,刪除操作有drop、truncate、delete,其中風(fēng)險(xiǎn)等級最高的是delete。
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。
下列關(guān)于用戶權(quán)限說法正確的是()
想要實(shí)現(xiàn)級聯(lián)刪除必須在數(shù)據(jù)外鍵上設(shè)置“級聯(lián)”的更新或刪除。
在insert語句中可以嵌入子查詢,通過子查詢將來自其他數(shù)據(jù)表的數(shù)據(jù)批量插入到所需的數(shù)據(jù)表中。
MySQL變量可分為兩大類,即()
MySQL數(shù)據(jù)庫中,通常將用戶寫入對應(yīng)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(xiàng)()