1.查询出每门课都大于 80 分的学生姓名
create table test2(
id int not null auto_increment,
name varchar(10),
kecheng varchar(10),
fenshu int,
primary key(id)
)
insert into test2(name,kecheng,fenshu) values('张三','语文',81 );
insert into test2(name,kecheng,fenshu) values('张三','数学',75 );
insert into test2(name,kecheng,fenshu) values('李四','语文',76 );
insert into test2(name,kecheng,fenshu) values('李四','数学',90 );
insert into test2(name,kecheng,fenshu) values('王五','语文',81 );
insert into test2(name,kecheng,fenshu) values('王五','数学',100);
insert into test2(name,kecheng,fenshu) values('王五','英语',90 );
-- (1)
select name
from test2 group by name
having min(fenshu) > 80;
王五
-- (2)
select distinct name from test2 where name not in (select distinct name from test2 where fenshu<=80)
王五
