A.Select* From Student Where Sex=’男’
B.Select* From Student Where Number NotIn(Select Number From Student Where Sex<>=’男’)
C.Select* From Student Where NumberIn(Select Numbe rFrom Student Where Sex=’男’)
D.Select* From Student Where Sex<>’男’
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A.Select Count(1)From Student
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A.左外連接
B.右外連接
C.內(nèi)連接
D.自身連接
A.Select *From Emp Where Job>="辦事員"
B.Select* From Emp Where Job==’辦事員’
C.Select* From Emp Where Job<>’辦事員’
D.Select* From Emp Where Job!=’辦事員’
A.elect * From Emp Where HirDate>='1981-1-1' And HirDate <='1981-12-31'
B.Select * From Emp Where Between In '1981-1-1' And <'1981-12-31'
C.Select * From Emp Where Between In '1981-12-31' And <'1981-1-1'
D.Select * From Emp Where HirDate>='1981-1-1' NOT HirDate <='1981-12-31'
A.Select * From Emp Where EmpNO In('791','792','793')
B.Select * From Emp Where EmpNO ='791' Or EmpNO='792' OR EmpNO='793'
C.Select * From Emp Where EmpNO >='791' And EmpNO<='793'
D.Select * From Emp Where EmpNO >'791' And EmpNO<'793'
最新試題
MySQL變量可分為兩大類,即()
MySQL權(quán)限管理分為兩個(gè)階段:服務(wù)器會(huì)檢查是否允許你連接,檢查你發(fā)出的每個(gè)請(qǐng)求,看是否有足夠的權(quán)限實(shí)施它。
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(duì)所有數(shù)據(jù)庫的所有權(quán)限。
參數(shù)的取名可以與數(shù)據(jù)表的列名相同。
MySQL通過賦予/撤銷某個(gè)用戶對(duì)某個(gè)數(shù)據(jù)庫或某個(gè)表的某項(xiàng)權(quán)力(讀、寫、更改、刪除等),來保證數(shù)據(jù)安全。
/*……*/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(huì)被執(zhí)行。
MySQL數(shù)據(jù)庫中,通常將用戶寫入對(duì)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)()
MySQL 5.0存貯過程的優(yōu)勢(shì)是()
MySQL變量可分為兩大類,即用戶變量和系統(tǒng)變量。
下列關(guān)于用戶權(quán)限說法正確的是()