A.Select * From Emp Where EmpNO Not In('791','792','793')
B.Select * From Emp Where EmpNO !='791' AND EmpNO!='792' And EmpNO='793'
C.Select * From Emp Where EmpNO <>'791' AND EmpNO<>792' And EmpNO=<>793'
D.Select * From Emp Where EmpNO =!'791' AND EmpNO =!'792' And EmpNO =!'793'
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A.Select * From Emp
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A.truncate table book
B.delete * from book
C.drop table book
D.delete from book
A.Update grade set score=score+5
B.Update grade set score=score+5 where score>=55 or score <=60
C.Update grade set score=score+5 where score between 55 and 60
D.Update grade set score=score+5 where score >=55 and score <=60
A.select top 1 * from book order by price asc
B.select top 1 * from book order by price desc
C.select top 1 * from book where price= (select max (price)from book)
D.select top 1 * from book where price= max(price)
A.select max(score) from grade
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最新試題
在以下選項(xiàng)中哪些屬于視圖的特點(diǎn)()
DELETE語(yǔ)句中使用JOIN子句執(zhí)行跨表刪除時(shí),有INNER、LEFT、RIGHT即內(nèi)連接、左連接、右連接等不同的連接方式。
不同的用戶(hù)合理地分配相應(yīng)權(quán)限,能有效控制不同用戶(hù)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(hù)寫(xiě)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(hù)權(quán)限得選項(xiàng)()
在insert語(yǔ)句中可以嵌入子查詢(xún),通過(guò)子查詢(xún)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。
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。
out模式定義的參數(shù)只能在過(guò)程體內(nèi)部賦值,表示該參數(shù)可以將某個(gè)值傳遞回調(diào)用他的過(guò)程。
MYSQL存儲(chǔ)過(guò)程優(yōu)點(diǎn)有,封裝性、增強(qiáng)SQL語(yǔ)句的功能和靈活性、減少網(wǎng)絡(luò)流量、高數(shù)據(jù)庫(kù)的安全性和數(shù)據(jù)的完整性。
下列關(guān)于用戶(hù)權(quán)限說(shuō)法正確的是()
MySQL通過(guò)賦予/撤銷(xiāo)某個(gè)用戶(hù)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(xiě)、更改、刪除等),來(lái)保證數(shù)據(jù)安全。