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
B.Select * From Emp Where EmpNO Like '%%'
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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
B.select top 1 score from grade order by score asc
C.Select min(score) from grade
D.select top 1 score from grade order by score desc
最新試題
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()
/*……*/用來標(biāo)記程序的注釋部分,注釋的目的是增加程序的可讀性,其中的內(nèi)容不會被執(zhí)行。
DELETE語句中使用JOIN子句執(zhí)行跨表刪除時,有INNER、LEFT、RIGHT即內(nèi)連接、左連接、右連接等不同的連接方式。
存儲過程命名規(guī)則與數(shù)據(jù)庫、數(shù)據(jù)表、列等標(biāo)識符命名可以隨心所欲,不需要規(guī)則一致。
下列關(guān)于用戶權(quán)限說法正確的是()
在MYSQL中,存儲過程不可以帶有參數(shù)。
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權(quán)限管理分為兩個階段:服務(wù)器會檢查是否允許你連接,檢查你發(fā)出的每個請求,看是否有足夠的權(quán)限實施它。
MySQL通過賦予/撤銷某個用戶對某個數(shù)據(jù)庫或某個表的某項權(quán)力(讀、寫、更改、刪除等),來保證數(shù)據(jù)安全。