我如何修改我的SQL语句，以使每个项目都有4位唯一的法官，而每个法官为他们分配的部门和类别平均评判相同数量的项目？
[人口项目需要由人口法官（x）次进行审查。x = 4
每个法官按部门和类别分组。
每个项目必须由（x）位唯一的评审人员进行审核。
create table judges(judge_id, division, category) as (
select 68, 'Elementary', 'ANY' from dual union all
select 19, 'Elementary', 'ANY' from dual union all
select 22, 'Elementary', 'ANY' from dual union all
select 32, 'Elementary', 'ANY' from dual union all
select 33, 'Elementary', 'ANY' from dual union all
select 37, 'Elementary', 'ANY' from dual union all
select 38, 'Elementary', 'ANY' from dual union all
select 40, 'Elementary', 'ANY' from dual union all
select 47, 'Elementary', 'ANY' from dual union all
select 62, 'Elementary', 'ANY' from dual union all
select 63, 'Elementary', 'ANY' from dual union all
select 13, 'Elementary', 'ANY' from dual union all
select 36, 'Elementary', 'ANY' from dual union all
select 55, 'Elementary', 'ANY' from dual union all
select 59, 'Elementary', 'ANY' from dual union all
select 60, 'Elementary', 'ANY' from dual union all
select 9, 'Junior', 'EC' from dual union all
select 10, 'Junior', 'EC' from dual union all
select 48, 'Junior', 'EC' from dual union all
select 11, 'Junior', 'LS' from dual union all
select 21, 'Junior', 'LS' from dual union all
select 23, 'Junior', 'LS' from dual union all
select 26, 'Junior', 'LS' from dual union all
select 31, 'Junior', 'LS' from dual union all
select 80, 'Junior', 'LS' from dual union all
select 14, 'Junior', 'PE' from dual union all
select 15, 'Junior', 'PE' from dual union all
select 24, 'Junior', 'PE' from dual union all
select 29, 'Junior', 'PE' from dual union all
select 30, 'Junior', 'PE' from dual union all
select 43, 'Junior', 'PE' from dual union all
select 53, 'Junior', 'PE' from dual union all
select 56, 'Junior', 'PE' from dual union all
select 57, 'Junior', 'PE' from dual union all
select 58, 'Junior', 'PE' from dual union all
select 65, 'Junior', 'PE' from dual union all
select 67, 'Junior', 'PE' from dual union all
select 69, 'Junior', 'PE' from dual union all
select 8, 'Senior', 'ANY' from dual union all
select 18, 'Senior', 'ANY' from dual union all
select 20, 'Senior', 'ANY' from dual union all
select 35, 'Senior', 'ANY' from dual union all
select 66, 'Senior', 'ANY' from dual union all
select 39, 'Senior', 'ANY' from dual union all
select 70, 'Senior', 'ANY' from dual union all
select 71, 'Senior', 'ANY' from dual union all
select 74, 'Senior', 'ANY' from dual union all
select 6, 'Senior', 'ANY' from dual union all
select 44, 'Senior', 'ANY' from dual union all
select 45, 'Senior', 'ANY' from dual union all
select 49, 'Senior', 'ANY' from dual union all
select 61, 'Senior', 'ANY' from dual union all
select 64, 'Senior', 'ANY' from dual union all
select 72, 'Senior', 'ANY' from dual union all
select 75, 'Senior', 'ANY' from dual union all
select 79, 'Senior', 'ANY' from dual union all
select 82, 'Senior', 'ANY' from dual
);
create table projects(project_id, division, category) as (
select 39, 'Elementary', 'ANY' from dual union all
select 40, 'Elementary', 'ANY' from dual union all
select 47, 'Elementary', 'ANY' from dual union all
select 48, 'Elementary', 'ANY' from dual union all
select 56, 'Elementary', 'ANY' from dual union all
select 57, 'Elementary', 'ANY' from dual union all
select 58, 'Elementary', 'ANY' from dual union all
select 60, 'Elementary', 'ANY' from dual union all
select 65, 'Elementary', 'ANY' from dual union all
select 66, 'Elementary', 'ANY' from dual union all
select 93, 'Elementary', 'ANY' from dual union all
select 94, 'Elementary', 'ANY' from dual union all
select 97, 'Elementary', 'ANY' from dual union all
select 104, 'Elementary', 'ANY' from dual union all
select 105, 'Elementary', 'ANY' from dual union all
select 107, 'Elementary', 'ANY' from dual union all
select 110, 'Elementary', 'ANY' from dual union all
select 112, 'Elementary', 'ANY' from dual union all
select 114, 'Elementary', 'ANY' from dual union all
select 117, 'Elementary', 'ANY' from dual union all
select 120, 'Elementary', 'ANY' from dual union all
select 121, 'Elementary', 'ANY' from dual union all
select 123, 'Elementary', 'ANY' from dual union all
select 124, 'Elementary', 'ANY' from dual union all
select 126, 'Elementary', 'ANY' from dual union all
select 127, 'Elementary', 'ANY' from dual union all
select 128, 'Elementary', 'ANY' from dual union all
select 133, 'Elementary', 'ANY' from dual union all
select 134, 'Elementary', 'ANY' from dual union all
select 136, 'Elementary', 'ANY' from dual union all
select 140, 'Elementary', 'ANY' from dual union all
select 142, 'Elementary', 'ANY' from dual union all
select 152, 'Elementary', 'ANY' from dual union all
select 153, 'Elementary', 'ANY' from dual union all
select 162, 'Elementary', 'ANY' from dual union all
select 167, 'Elementary', 'ANY' from dual union all
select 173, 'Elementary', 'ANY' from dual union all
select 174, 'Elementary', 'ANY' from dual union all
select 188, 'Elementary', 'ANY' from dual union all
select 27, 'Junior', 'EC' from dual union all
select 67, 'Junior', 'EC' from dual union all
select 82, 'Junior', 'EC' from dual union all
select 83, 'Junior', 'EC' from dual union all
select 99, 'Junior', 'EC' from dual union all
select 113, 'Junior', 'EC' from dual union all
select 115, 'Junior', 'EC' from dual union all
select 149, 'Junior', 'EC' from dual union all
select 164, 'Junior', 'EC' from dual union all
select 169, 'Junior', 'EC' from dual union all
select 185, 'Junior', 'EC' from dual union all
select 189, 'Junior', 'EC' from dual union all
select 18, 'Junior', 'LS' from dual union all
select 19, 'Junior', 'LS' from dual union all
select 20, 'Junior', 'LS' from dual union all
select 21, 'Junior', 'LS' from dual union all
select 23, 'Junior', 'LS' from dual union all
select 24, 'Junior', 'LS' from dual union all
select 26, 'Junior', 'LS' from dual union all
select 28, 'Junior', 'LS' from dual union all
select 29, 'Junior', 'LS' from dual union all
select 30, 'Junior', 'LS' from dual union all
select 78, 'Junior', 'LS' from dual union all
select 80, 'Junior', 'LS' from dual union all
select 90, 'Junior', 'LS' from dual union all
select 91, 'Junior', 'LS' from dual union all
select 106, 'Junior', 'LS' from dual union all
select 144, 'Junior', 'LS' from dual union all
select 150, 'Junior', 'LS' from dual union all
select 151, 'Junior', 'LS' from dual union all
select 156, 'Junior', 'LS' from dual union all
select 157, 'Junior', 'LS' from dual union all
select 159, 'Junior', 'LS' from dual union all
select 161, 'Junior', 'LS' from dual union all
select 165, 'Junior', 'LS' from dual union all
select 166, 'Junior', 'LS' from dual union all
select 168, 'Junior', 'LS' from dual union all
select 178, 'Junior', 'LS' from dual union all
select 180, 'Junior', 'LS' from dual union all
select 187, 'Junior', 'LS' from dual union all
select 22, 'Junior', 'PE' from dual union all
select 59, 'Junior', 'PE' from dual union all
select 61, 'Junior', 'PE' from dual union all
select 74, 'Junior', 'PE' from dual union all
select 81, 'Junior', 'PE' from dual union all
select 95, 'Junior', 'PE' from dual union all
select 96, 'Junior', 'PE' from dual union all
select 116, 'Junior', 'PE' from dual union all
select 145, 'Junior', 'PE' from dual union all
select 148, 'Junior', 'PE' from dual union all
select 158, 'Junior', 'PE' from dual union all
select 160, 'Junior', 'PE' from dual union all
select 172, 'Junior', 'PE' from dual union all
select 176, 'Junior', 'PE' from dual union all
select 181, 'Junior', 'PE' from dual union all
select 186, 'Junior', 'PE' from dual union all
select 14, 'Senior', 'ANY' from dual union all
select 15, 'Senior', 'ANY' from dual union all
select 42, 'Senior', 'ANY' from dual union all
select 43, 'Senior', 'ANY' from dual union all
select 44, 'Senior', 'ANY' from dual union all
select 45, 'Senior', 'ANY' from dual union all
select 46, 'Senior', 'ANY' from dual union all
select 49, 'Senior', 'ANY' from dual union all
select 51, 'Senior', 'ANY' from dual union all
select 52, 'Senior', 'ANY' from dual union all
select 53, 'Senior', 'ANY' from dual union all
select 54, 'Senior', 'ANY' from dual union all
select 75, 'Senior', 'ANY' from dual union all
select 76, 'Senior', 'ANY' from dual union all
select 77, 'Senior', 'ANY' from dual union all
select 92, 'Senior', 'ANY' from dual union all
select 108, 'Senior', 'ANY' from dual union all
select 118, 'Senior', 'ANY' from dual union all
select 119, 'Senior', 'ANY' from dual union all
select 125, 'Senior', 'ANY' from dual union all
select 131, 'Senior', 'ANY' from dual union all
select 132, 'Senior', 'ANY' from dual union all
select 135, 'Senior', 'ANY' from dual union all
select 137, 'Senior', 'ANY' from dual union all
select 138, 'Senior', 'ANY' from dual union all
select 139, 'Senior', 'ANY' from dual union all
select 141, 'Senior', 'ANY' from dual union all
select 143, 'Senior', 'ANY' from dual union all
select 146, 'Senior', 'ANY' from dual union all
select 154, 'Senior', 'ANY' from dual union all
select 171, 'Senior', 'ANY' from dual
);
select
project_id
,division
,category
,judge_id
,best_match
from(
select
project.project_id
,project.division
,project.category
,judge.judge_id
,row_number() over(
partition by project.project_id
order by dbms_random.value
) as best_match
from frsf_fair.project_division_category project
left join (
select
judge_id
,division
,category
,row_number() over(
partition by division
order by dbms_random.value
) as r
from frsf_fair.judge_division_category
) judge on project.division = judge.division
and project.category = judge.category
) assignment
where best_match <= 4
PROJECT_ID DIVISION CATEGORY JUDGE_ID BEST_MATCH
14 Senior ANY 72 1
14 Senior ANY 74 2
14 Senior ANY 20 3
14 Senior ANY 44 4
15 Senior ANY 79 1
15 Senior ANY 39 2
15 Senior ANY 75 3
15 Senior ANY 20 4
18 Junior LS 23 1
18 Junior LS 31 2
18 Junior LS 26 3
18 Junior LS 21 4
count（*）/项目的数量应在法官的部门和类别之间平均分配。相反，有些法官被分配给20个项目，而另一些法官则分配给很少的人。我不知道如何修改查询，因此每个法官在项目部门和类别分组中必须被引用相同的次数。我想确保平等参与。
JUDGE_ID COUNT(*)
64 8
72 16
23 20
57 4
14 4
6 4
58 9
我能做的最好的就是这个查询：
with
t as (select judge_id jid, project_id pid, category cat, division div,
dense_rank() over (order by project_id) rp,
dense_rank() over (order by judge_id) rj,
count(1) over (partition by project_id) cnt
from judges join projects using (division, category)),
c(pid, jid, cat, div, rn, rp) as (
select pid, jid, cat, div, 1, rp from t where mod(rp, cnt) = mod(rj, cnt)
union all
select c.pid, t.jid, c.cat, c.div, rn + 1, c.rp
from c join t on c.rp = t.rp and c.jid <> t.jid
and mod(t.rp, t.cnt) = mod(t.rj + c.rn, t.cnt)
where rn < 3)
select * from c
它做什么？首先，基本连接添加了行号和计数（rp，rj，cnt）。然后，这些列由mod()用于联接锚查询where mod(rp, cnt) = mod(rj, cnt)中的行。然后是递归部分，该部分仅将所需数量的法官添加到每个项目中。也许有人可以做到而无需递归，但是我却做不到。您可以通过为法官分配随机的id并在查询中使用它们代替实际的id来对输出进行某种程度的随机化。将3替换为所需的评论数。
此dbfiddle显示5个项目，5名评审，每个项目3条评论。法官不重复，平均分配。
编辑：这是已纠正的基本查询：
with t as (
select category, division, project_id, judge_id,
dense_rank() over (partition by category, division
order by project_id) rp,
dense_rank() over (partition by category, division, project_id
order by judge_id) rj,
count(1) over (partition by project_id) cnt
from projects join judges using (category, division) )
select * from t
join (select level lvl from dual connect by level <= 3)
on mod(rj, cnt) = mod((rp -1) * 3 + lvl, cnt)
我检查了项目的结果（按project_id分组），每个项目都有3位不同的评委。我检查了法官的结果（按类别，分组，法官ID），并且他班上的每个法官都有相同的案件数（如果没有足够的项目来平均分配，则相差一）。
逻辑与我的第一个查询相同。正如我所说的，您可以先随机分配法官：
select row_number() over (order by dbms_random.value) rnd_jdg_id, judges.* from judges
并使用这个假ID作为主查询的输入，以获取完全随机的分配。
我想出了一个利用Oracle数据库中的过程的解决方案。
我的方法是遍历每个项目ID。在我的循环中，它将循环1到我需要的分配数量，在这种情况下为4。
[我们需要从法官名单中抽取一个随机的法官ID，方法是对已经按升序分配的任务数进行计数。我想先使用最少数量的作业。
如果+1，他们的分配计数
我们更新最终列表中的值
我们一直循环直到给出按项目分配的任务数量，然后评估下一个项目。
创建或替换过程random_judge_project_list为
assign_count number := 0; next_count number := 1; assignments number := 4; jid number; sql_stmt varchar2(4000); location varchar2(20);开始
execute immediate 'truncate table judge_project_list'; execute immediate 'update judge_assignment_count set assignment_count = 0'; /*We First Need to Loop through Each Project*/ for project in ( select project_id ,division ,category as source_category ,case division when 'Junior' then category else 'ANY' end as category from projects a order by division asc, category asc ) loop /*While Looping we then need to assign judges randomly*/ for assign in 1 .. assignments loop select judge_id into jid from( select * from judge_assignment_count where division = project.division and judge_id not in (select judge_id from judge_project_list where project_id = project.project_id) order by assignment_count asc, dbms_random.random asc ) where rownum = 1 ; select assignment_count into assign_count from judge_assignment_count where judge_id = jid and rownum = 1 ; next_count := assign_count + 1; --dbms_output.put_line(sql_stmt); --execute immediate sql_stmt into jid; insert into judge_project_list (project_id, judge_id, division, category) values (project.project_id, jid, project.division, project.category); execute immediate 'update judge_assignment_count set assignment_count = ' || next_count || ' where judge_id = ' || jid; end loop; end loop; commit;end;