把student表按照“性别”这个单列进行分组的语句为select 女 from student group by性别。（)

A.A. SELECT Sno, Sname FROM sC WHERE Grade>75

B.B. SELECT Sno, Sname FROM Student WHERE Grade>75

C.C. SELECT Sno, Sname FROM Student WHERE Sno lN(SELECT Sno FROM SC WHERE Grade>75 )

D.D. SELECT Sno, Sname FROM Student WHERE Sno lN(SELECT Sno FROM SC HAVING Grade>75 )

A.A.grant select emp to scott

B.B.grant select on emp to scott

C.C.grant on emp select to scott

D.D.grant scott on emp

A.select count(all) from emp;

B.select count(emp_id) from emp;

C.select count(*) from emp;

D.select count(1) from emp;

A.使用delete语句从表中删除数据

B.使用truncatetable语句从表中删除数据

C.使用droptable语句从表中删除数据

D.使用一个可更新的游标访问和删除表中的毎一行数据

A.人口按性别分组

B.企业按所有制分组

C.家庭按收入水平分组

D.职工按文化程度分组

A.insert触发器

B.delete触发器

C.update触发器

D.select触发器