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
B.Select Sum(*)From Student
C.Selec tAvg(*)From Student
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A.左外连接
B.右外连接
C.内连接
D.自身连接
A.Select *From Emp Where Job>="办事员"
B.Select* From Emp Where Job==’办事员’
C.Select* From Emp Where Job<>’办事员’
D.Select* From Emp Where Job!=’办事员’
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
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)
最新试题
在MySQL中,用单条INSERT语句处理多个插入要比使用多条INSERT语句效率更高。
MySQL数据库中,通常将用户写入对应的权限表来控制访问权限的,以下属于用户权限得选项()
DELETE语句中使用JOIN子句执行跨表删除时,有INNER、LEFT、RIGHT即内连接、左连接、右连接等不同的连接方式。
存储过程命名规则与数据库、数据表、列等标识符命名可以随心所欲,不需要规则一致。
视图就是一个虚表,保存视图时,保存的是视图的定义。
插入作为一种SQL操作,除了需要正确的命令语法外,还要求插入数据必须与数据表上的(),否则正确的语法也无法实现正常的插入操作。
在实际应用中,为了防止新建视图与已存在的视图重名产生冲突,常用CREATE OR REPLACE VIEW来创建新视图。
存储过程一经定义,就可以被反复调用,从而实现了代码的复用性、封装性、高性能等。
MySQL变量可分为两大类,即()
mysql变量有4种类型:局部变量、用户变量、会话变量和全局变量。