请帮忙写一个SQL语句...
覆水难收 2010-12-16 02:09:34
我得SQL语句:
select * from person_info join person_post on person_info.p_userid = person_post.p_userid join person_res on person_info.p_info_id =person_res.p_info_id where person_post.p_post_hy = '计算机软件' and p_res_gxtime >to_date('2010-9-17','yyyy-mm-dd hh24:mi:ss')
得到了N条记录...而,现在我只想要这N条记录当中的随即 3条..该怎么写?