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create table tbl ( org_id int, patient_id int, date date ); insert into tbl values (313, 455259, '2018-01-07'), (313, 455259, '2018-04-09'), (679, 455259, '2018-07-08'), (780, 455259, '2018-09-06'); with data as ( select patient_id, org_id, date, lag(org_id) over (partition by patient_id order by date) prev_org_id from tbl ) select * from data where org_id != prev_org_id and prev_org_id is not null;

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