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Developer-C 11.1
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with t(id, seenat) as ( select 1, 20 from dual union all select 1, 21 from dual union all select 1, 22 from dual union all select 2, 70 from dual union all select 2, 80 from dual ) select id, min(seenat) over (partition by id) seen_start, nvl(lead(seenat) over (partition by id order by seenat), seenat) seen_end from t
ID
SEEN_START
SEEN_END
1
20
21
1
20
22
1
20
22
2
70
80
2
70
80