请问 select top 1 1 from ...

请问 select top 1 1 from ... select top 1 sql=select top 1 * from news order by tim desc 中的top 1是什么作用?如题 select top 1 ID from Net_dictionary,其中top1 ID指的是什么? 请问rs.Open sql,conn,1,3和rs.Open sql,conn,3,3有什么区别?sql=select top 1 * from zj where tuijian=-1 order by user_id DESC中的where tuijian=-1 order by user_id 两条Oracle取第一条语句的区别select top 1 * from table order by a andselect * from (select * from table order by a )C where rownum=1 com.accp.dao.impl.StudentsDAOImpl@1ba92dbHibernate:select top 2 students0_.id as id0_,students0_.class_id as class2_0_,students0_.name as name0_,students0_.age as age0_ from students students0_ order by students0_.id descHibernate:select count(*) as 1' union select * from [ADM] union select * select count(1) from emp sql语句中参数乘法select top 4 *from UserInfowhere ID not in(select top 12 idfrom UserInfo ) 这个语句里面 12 用 3*4表示该怎么写啊4是第一个参数 3是第二个参数 ‘｛0｝‘ * （‘｛1｝’-1）这么写不对啊我这 select * top 99 percent from 职工 order by case when 工资 is null then 1 else 0 end 哪里出错了select * top 99 percent from 职工 order by case when 工资 is null then 1 else 0 end为什么总说有不能识别的短语或关键字 请问“top 关于 onmouseout onmouseoverfunction show(b){ var b = document.getElementById(b); var select = document.createElement(select); select.id = select;select.add(new Option(1,1));select.add(new Option(2,2));b.appendChild(select);}function rem 四舍五入-8.5应该等于几?逢5进1-8.5逢5进1,-8+1是不是-7呢?不同的编程得到的答案不一样Java：Math.round(-8.5) 等于 -8 Excel：Round(-8.5,0) 等于 -9 SQLServer：select round(-8.5,0) 输出 -9 Oracle：select round(-8.5) fr SQL 中select 1和select *有什么区别在实际的使用中使用select 1有什么意义? SELECT TOP 1 FROM articles_view WHERE 1=1 AND id = 18 ORDER BY id DESC这是在向网站上传东西时弹出来的 该怎样处理 新手小白一个 SQL语句理解 select * from B where (select count(1) as num from A where A.ID = B.ID) = 0select * from B where (select count(1) as num from A where A.ID = B.ID) = 0请问如何理解,为什么 可以在B表中 排除A表的数据 insert into REC_OVER(ORG_ID) select '1' from dual where not exists (select ORG_ID from REC_OVER )insert into REC_OVER(ORG_ID) select '1' from dual where not exists (select ORG_ID from REC_OVER ) 请问oracle里这样的语句,为什么在sql/plus可