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create table mytable (ID int, GroupID1 int, GroupID2 int, GroupID3 int); insert into mytable VALUES (1, 10, 20, 30), (2, 10, 21, 31), (3, 11, 21, 31), (4, 12, 22, 32), (5, 13, 23, 33), (6, 14, 24, 33), (7, 14, 25, 34), (8, 15, 26, 36) ;
8 rows affected
with nodes as ( select t.id, v.grp from mytable t cross apply ( values (t.GroupID1), (t.GroupID2), (t.GroupID3) ) v(grp) ), edges as ( select distinct n1.id as id1, n2.id as id2 from nodes n1 inner join nodes n2 on n1.grp = n2.grp ), rec as ( select id1, id2, cast(id1 as nvarchar(max)) as visited from edges union all select r.id1, e.id2, concat(r.visited, ',', e.id2) from rec r inner join edges e on e.id1 = r.id2 where concat(',', r.visited, ',') not like concat('%,', e.id2, ',%') ), fin as ( select id1, min(value) min_id from rec r cross apply string_split(r.visited, ',') group by id1 ) select id1 as id, dense_rank() over(order by min_id) grp from fin f
id
grp
1
1
2
1
3
1
4
2
5
3
6
3
7
3
8
4