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
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
想要實現(xiàn)級聯(lián)刪除必須在數(shù)據(jù)外鍵上設置“級聯(lián)”的更新或刪除。
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力(讀、寫、更改、刪除等),來保證數(shù)據(jù)安全。
out模式定義的參數(shù)只能在過程體內部賦值,表示該參數(shù)可以將某個值傳遞回調用他的過程。
存儲過程一經(jīng)定義,就可以被反復調用,從而實現(xiàn)了代碼的復用性、封裝性、高性能等。
在MySQL中,使用insert語句向數(shù)據(jù)庫表插入數(shù)據(jù)記錄的方式有()
/*……*/用來標記程序的注釋部分,注釋的目的是增加程序的可讀性,其中的內容不會被執(zhí)行。
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變量有4種類型:局部變量、用戶變量、會話變量和全局變量。
下列關于用戶權限說法正確的是()
視圖的意義:為用戶集中提取數(shù)據(jù)、隱蔽數(shù)據(jù)庫的復雜性,使操作簡便化、增加數(shù)據(jù)的安全性、提高表的邏輯獨立性。