三大数据库如何获取表中的第m条到第n条记录（n大于m）

1、oracle数据库：（注：tableName.id指的是tableName的主键）

select * from

(select tableName.*,rownum as con from tableName

where rownum <= m

order by tableName.id desc)

where con >= n;

2、SQLServer数据库：（注：tableName.id指的是tableName的主键）

实现原理解释：

1）先查出前m面条记录

2）再查出前n面条记录

3）最后通过条件过滤掉前m条记录

方法一：

select top n-m+1 * from tableName

where tableName.id not in

(select top m tableName.id from tableName order by desc tableName.id)

order by tableName.id

方法二：

select top n-m+1 * from tableName as a where not exists

(select * from

(select top m * from tableName order by id desc) b

where b.id = a.id)

order by id desc

3、MySQL数据库：

select * from tableName limit m, n;