oracle排名函数的使用方法分享

数据库  /  管理员 发布于 6年前   293

在oracle中，有rank,dense_rank,row_number，以及分组排名partition。

说明：

rank:排名会出现并列第n名，它之后的会跳过空出的名次，例如：1,2,2,4
dense_rank:排名会出现并列第n名，它之后的名次为n+1，例如：1,2,2,3
row_number:排名采用唯一序号连续值，例如1,2,3,4
partition:将排名限制到某一分组

格式：
 

row_number() over(partition by bb.channel_name order by sum(aa.dk_serv_num) desc nulls last) p1_rank1,
row_number() over(order by sum(aa.dk_serv_num) desc nulls last) rank1,
dense_rank() over(order by nvl(sum(aa.dk_serv_num), 0) desc) rank2,
rank() over(order by sum(aa.dk_serv_num) desc nulls last) rank3

例子：

procedure GetCompetitionRanking(p_UserId in integer, p_CompetitionId in integer, v_cursor out CompetitionCursor)isv_startDate date;v_endDate date;tmp_startDate varchar2(12);tmp_endDate varchar2(12);tmp_date date;v_sql1 varchar2(2000);v_sql2 varchar2(2000);v_where varchar2(1000);v_comTotal integer;v_groupTotal integer;v_comRanking integer;v_groupRanking integer;beginselect t.start_date, t.end_date into v_startDate, v_endDate from tbl_competition t where t.competition_id = p_CompetitionId;tmp_date:= v_endDate+1;tmp_startDate := to_char(v_startDate, 'yyyy-mm-dd');tmp_endDate := to_char(tmp_date, 'yyyy-mm-dd');--group personal totalselect count(1) into v_groupTotal from tbl_com_group_user awhere a.com_group_id in(select b.com_group_id from tbl_com_group_user b where b.user_id = p_UserId);-- Competition personal totalselect count(1) into v_comTotal from(select a.com_group_id from tbl_com_group a where a.competition_id = p_CompetitionId) a inner join tbl_com_group_user b on a.com_group_id = b.com_group_id;--user in competition ranking and group rankingv_where := 't.DATA_TYPE_ID=1 AND t.STATUS=1 ANDt.DATA_DATE_1 >= TO_DATE('||chr(39)||tmp_startDate||chr(39)||','||chr(39)||'yyyy-mm-dd'||chr(39)||') ANDt.DATA_DATE_1 < TO_DATE('||chr(39)||tmp_endDate||chr(39)||','||chr(39)||'yyyy-mm-dd'||chr(39)||') ';/*select no from(select a.USER_ID, dense_rank() over(order by sum(nvl(DATA_NUMBER_2, 0)) desc) no from(select user_id from tbl_com_group aleft join tbl_com_group_user b on a.com_group_id = b.com_group_idwhere a.competition_id = 1) a left join VM_MASTER_DATA t on a.user_id = t.user_id and t.DATA_TYPE_ID=1 AND t.STATUS=1 ANDt.DATA_DATE_1 >= TO_DATE('2012-10-02','yyyy-mm-dd') ANDt.DATA_DATE_1 < TO_DATE('2012-12-01','yyyy-mm-dd') group by a.user_idorder by no desc) where user_id = 165*/v_sql1 := 'select no from(select a.USER_ID, dense_rank() over(order by sum(nvl(DATA_NUMBER_2, 0)) desc) no from(select user_id from tbl_com_group aleft join tbl_com_group_user b on a.com_group_id = b.com_group_idwhere a.competition_id = '||p_CompetitionId||') a left join VM_MASTER_DATA t on a.user_id = t.user_id and '|| v_where||'group by a.user_idorder by no desc ) where user_id = '||p_UserId;dbms_output.put_line(v_sql1);execute immediate v_sql1 into v_comRanking;dbms_output.put_line('------------------------------');--dbms_output.put_line(v_comRanking);/*select no from( select a.USER_ID, dense_rank() over(order by sum(nvl(DATA_NUMBER_2, 0)) desc) no from(select a.user_id from tbl_com_group_user awhere a.com_group_id in(select b.com_group_id from tbl_com_group_user b where b.user_id = 165)) a left join VM_MASTER_DATA t on a.user_id = t.user_id and t.DATA_TYPE_ID=1 AND t.STATUS=1 ANDt.DATA_DATE_1 >= TO_DATE('2012-10-02','yyyy-mm-dd') ANDt.DATA_DATE_1 < TO_DATE('2012-12-01','yyyy-mm-dd') group by a.user_idorder by no desc)where user_id=165*/v_sql2 := 'select no from(select a.USER_ID, dense_rank() over(order by sum(nvl(DATA_NUMBER_2, 0)) desc) nofrom(select a.user_id from tbl_com_group_user awhere a.com_group_id in(select b.com_group_id from tbl_com_group_user b where b.user_id = '||p_UserId||')) a left join VM_MASTER_DATA t on a.user_id = t.user_id and '|| v_where||'group by a.user_idorder by no desc ) where user_id = '||p_UserId;dbms_output.put_line(v_sql2);execute immediate v_sql2 into v_groupRanking;--dbms_output.put_line('------------------------------');--dbms_output.put_line(v_groupRanking);if v_comRanking is null thenv_comRanking := v_comTotal;end if;if v_groupRanking is null thenv_groupRanking := v_groupTotal;end if;open v_cursor forselect v_comTotal CompetitionPersonalTotal, v_groupTotal UserInGroupPersonTotal, v_comRanking UserInCompRanking, v_groupRanking UserInGroupRanking from dual;exceptionwhen others thennull;end;