select.where student_id>3 GROUP BY math_mark having AVG(math_mark)>70什么意思啊?GROUP BY math_mark having AVG(math_mark)>70 主要是这一部分

为什么 select * from student left outer join takes on true where student.id=takes.id; 运行不了为什么 select * from student left outer join takes on true where student.id=takes.id; 运行不了 这是书上的 vf中,where & cn 程序如下：select student inner join score;on student.ke=score.ke;where & cn;into table abc其中where & select id,name from student where id in ( select id from score having count(id)>=2 );以上这段语句有没语法错误.SQL语句 select * from student where name like '%[^ja,as,on]%' 这是我自己建的一个表,查询的结果 select * from teacher where s_id in(select s_id from student) s_id栏位在student表中无,但是不报错建立如下两个表student(id,name)teacher(id,name,s_id)为什麽以下这个SQL不报错,S_ID栏位在student表中根本不存在select * f select Student.Sno,Sname,Ssex,Cname,Grade from Student,SC,Course where Student.Sno=SC.Sno and SC.Cnoorder by Student.Sno 用sql server对上述结果做分页显示,我以前没学过对分页不了解, (select * from student where sname like '王%') 我查出了姓王的,但那非 字 不知道怎么表示了.题目是查表 student中不是姓王的信息 select * into b from a where 11 SQL 语句 SELECT * FROM {{table}} WHERE `fleet_end_time` sql语句中!例如SELECT STUDENT.学号,student.姓名from sdb!student spring中select * from student,和select * from [数据库名].[dbo].[student],怎么别人用前者可以,我不能 SELECT 请问谁知道在sqlserver中怎样查栏位中含有汉字的所有记录. select * from student where name 是 汉字由于这个表 记录很多,大部分name列都不是汉字,我想找出 所有name为汉字的行 SELECT student_id FROM tuition where student_id in ( SELECT student_id FROM student_temp )上面的这个SQL语句是要选择student-id在student_temp 中的,而不是 tuition的,这样写有没有问题的?是我要得到的数据结果吗?运行 ms sql :select * from (select *from b) as xxx where 和 select * from (select *from b) xxx where区select * from (select *from b) as xxx where…… 和 select * from (select *from b) xxx where……的区别别告诉我是一样的.因为我有一 select * from user_info where user_name in (select user_name from user)怎么改写提高效率谢谢了. select * from (select a.*,rownum aa from table a ) where aa=10 sql里,where a in (select .) and b in (select .)这种表示合法吗?