oracle排名函数的使用方法分享

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)

									is

									v_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;

									begin

									select 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 total

									select count(1) into v_groupTotal from tbl_com_group_user a

									where a.com_group_id in

									(

									select b.com_group_id from tbl_com_group_user b where b.user_id = p_UserId

									);

									-- Competition personal total

									select 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 ranking

									v_where := 't.DATA_TYPE_ID=1 AND t.STATUS=1 AND

									t.DATA_DATE_1 >= TO_DATE('||chr(39)||tmp_startDate||chr(39)||','||chr(39)||'yyyy-mm-dd'||chr(39)||') AND

									t.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 a

									left join tbl_com_group_user b on a.com_group_id = b.com_group_id

									where 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 AND

									t.DATA_DATE_1 >= TO_DATE('2012-10-02','yyyy-mm-dd') AND

									t.DATA_DATE_1 < TO_DATE('2012-12-01','yyyy-mm-dd') 

									group by a.user_id

									order 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 a

									left join tbl_com_group_user b on a.com_group_id = b.com_group_id

									where 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_id

									order 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 a

									where 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 AND

									t.DATA_DATE_1 >= TO_DATE('2012-10-02','yyyy-mm-dd') AND

									t.DATA_DATE_1 < TO_DATE('2012-12-01','yyyy-mm-dd') 

									group by a.user_id

									order 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) no

									from

									(

									select a.user_id from tbl_com_group_user a

									where 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_id

									order 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 then

									v_comRanking := v_comTotal;

									end if;

									if v_groupRanking is null then

									v_groupRanking := v_groupTotal;

									end if;

									open v_cursor for

									select v_comTotal CompetitionPersonalTotal, v_groupTotal UserInGroupPersonTotal, v_comRanking UserInCompRanking, v_groupRanking UserInGroupRanking from dual;

									exception

									when others then

									null;

									end;

oracle排名函数的使用方法分享

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