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’
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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'
A.Select * From Emp
B.Select * From Emp Where EmpNO Like '%%'
C.Select * From Emp Where Name = '%%'
D.Select * From Emp Where Name Like '%%'
A.truncate table book
B.delete * from book
C.drop table book
D.delete from book
最新試題
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(fù)雜性,使操作簡(jiǎn)便化、增加數(shù)據(jù)的安全性、提高表的邏輯獨(dú)立性。
在以下選項(xiàng)中哪些屬于視圖的功能()
插入作為一種SQL操作,除了需要正確的命令語法外,還要求插入數(shù)據(jù)必須與數(shù)據(jù)表上的(),否則正確的語法也無法實(shí)現(xiàn)正常的插入操作。
mysql變量有4種類型:局部變量、用戶變量、會(huì)話變量和全局變量。
正常情況下一般刪除命令都會(huì)有帶WHERE子句。
在以下選項(xiàng)中哪些屬于視圖的特點(diǎn)()
視圖就是一個(gè)虛表,保存視圖時(shí),保存的是視圖的定義。
在MYSQL中,存儲(chǔ)過程不可以帶有參數(shù)。
MySQL 5.0存貯過程的優(yōu)勢(shì)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。