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Developer-C 11.1
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with t as ( select v.* from (values (1, 3), (2, 4), (7, 12), (7, 15), (14, 21) ) v(col1, col2) ) select grp, min(col1), max(col2) from (select t.*, sum(case when prev_col2 >= col1 then 0 else 1 end) over (order by col1, col2) as grp from (select t.*, lag(col2) over (order by col1, col2) as prev_col2 from t ) t ) t group by grp
grp
(No column name)
(No column name)
1
1
4
2
7
21