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CREATE TABLE t ("id" int, "dt" datetime) ; INSERT INTO t ("id", "dt") VALUES (12345, '2022-08-25 08:45:00'), (12345, '2022-08-25 09:45:00'), (12345, '2022-08-25 13:00:00'), (12345, '2022-08-25 13:30:00'), (23456, '2022-08-25 10:00:00'), (23456, '2022-08-25 11:00:00')
6 rows affected
select id ,date ,date2 from ( select id ,dt as "date" ,lead(dt) over (partition by id order by dt) as "date2" ,row_number() over (partition by id order by dt) as rn from t ) t where rn % 2 != 0 order by id
id
date
date2
12345
2022-08-25 08:45:00.000
2022-08-25 09:45:00.000
12345
2022-08-25 13:00:00.000
2022-08-25 13:30:00.000
23456
2022-08-25 10:00:00.000
2022-08-25 11:00:00.000