A.GROUP BY WHERE HAVING
B.WHE REGROUP BY HAVING
C.WHE REHAVING GROUP BY
D.HAVING WHERE GROUP BY
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A.select CustomerName,SalesDate from Sales group by CustomerName,SalesDate
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最新試題
mysql變量有4種類型:局部變量、用戶變量、會(huì)話變量和全局變量。
在SQL中,刪除操作有drop、truncate、delete,其中風(fēng)險(xiǎn)等級(jí)最高的是delete。
在insert語(yǔ)句中可以嵌入子查詢,通過(guò)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變量可分為兩大類,即用戶變量和系統(tǒng)變量。
不同的用戶合理地分配相應(yīng)權(quán)限,能有效控制不同用戶對(duì)不同數(shù)據(jù)的“增刪秘方”權(quán)限,是保護(hù)數(shù)據(jù)的一種有效手段。
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(wèn)權(quán)限的,以下屬于用戶權(quán)限得選項(xiàng)()
想要實(shí)現(xiàn)級(jí)聯(lián)刪除必須在數(shù)據(jù)外鍵上設(shè)置“級(jí)聯(lián)”的更新或刪除。
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。
MySQL 5.0存貯過(guò)程的優(yōu)勢(shì)是()
以下關(guān)于級(jí)聯(lián)刪除描述正確的是()