A.Select Count(1)From Student
B.Select Sum(*)From Student
C.Selec tAvg(*)From Student
D.Select Count(*)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'
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'
最新試題
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。
在以下選項中哪些屬于視圖的特點()
MySQL 5.0存貯過程的優(yōu)勢是()
以下分支結(jié)構(gòu)控制語句正確的是()
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()
下列關(guān)于用戶權(quán)限說法正確的是()
以下關(guān)于級聯(lián)刪除描述正確的是()
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。
在SQL中,刪除操作有drop、truncate、delete,其中風(fēng)險等級最高的是delete。
視圖就是一個虛表,保存視圖時,保存的是視圖的定義。