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select v.* into t from (values (123, 234), (234, 345), (345, 456), (567, 678), (789, 890) ) v(Client, owner)
5 rows affected
with cte as ( select t.client, convert(varchar(max), t.owner) as owners, owner as last_owner, 1 as lev from t where not exists (select 1 from t t2 where t2.owner = t.client) union all select cte.client, concat(cte.owners, ',', t.owner), t.owner, lev + 1 from cte join t on t.client = cte.last_owner ) select top (1) with ties client, owners from cte order by row_number() over (partition by client order by lev desc)
client
owners
123
234,345,456
567
678
789
890