oracle排名函数的使用方法分享
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2023-11-18 21:56:58
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...
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;