1.总结Oracle 、sqlserver和mysql中查询10-20条记录的写法

一： oracle数据库写法：

1：select * from (select rownum rn ,* from 表名 wher rownum<20) a

where a.rn>10

2：select * from 表名 where rownum<20

minus

select * from 表名 where rownum<10

二：SqlServer数据库写法：

1:select top 20 * from tablename where id not?exists (select top 10 * from tablename)//前20条记录再过滤掉前10条

2:select top10 * from (select top 20 * from order by column) order by column desc//子查询中取20条倒序，然后从子查询中取前10条

三：mysql的写法：

select * from tablename where LIMIT 9,10