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;