数据库下的分页代码

最近一段时间都在搞复习，没办法，得面试找工作...在数据库方面还是有点薄弱，得好好复习一下才行，下面是三种常用的数据库的分页sql:

sql server:

       String sql =

       "select top " + pageSize + " * from students where id not in" +

 "(select top " + pageSize * (pageNumber-1) + " id from students order by id)" +"order by id";

 

mysql:

       String sql =

       "select * from students order by id limit " + pageSize*(pageNumber-1) + "," + pageSize;

oracle:

       String sql =  "select * from " +   (select *,rownum rid from (select * from students order by postime desc) where rid<=" + pagesize*pagenumber + ") as t" +  "where t>" + pageSize*(pageNumber-1);