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Create table Agents ( Agent char(1), [Location] int ); insert into Agents VALUES ('A', 1), ('A', 2), ('A', 6), ('B', 3), ('B', 4), ('C', 1), ('C', 4), ('C', 5); select t.Agent, STRING_AGG(t.Location, ',') WITHIN GROUP (ORDER BY Location ASC) as Locations from ( select Agent, Location, rank() over (partition by [Location] order by Agent) as rnk from Agents ) as t --will return agents with distinct locations, because they have the rank equals to 1 where t.rnk = 1 group by t.Agent;

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