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WITH data AS ( SELECT * FROM (VALUES ('a', 2, 3), ('a', 3, 5), ('a', 5, 7), ('a', 8, 10), ('a', 10, 12), ('a', 12, 14), ('b', 7, 8), ('b', 8, 10), ('b', 12, 15), ('c', 10, 11) ) AS T(tag, v_start, v_stop) ORDER BY tag, v_start, v_stop ), cte1 as( select *, case when lag(v_stop)over(partition by tag order by(select null)) = v_start then 0 else 1 end as grp from data ), cte2 as( select *, sum(grp) over (partition by tag order by v_start) as rnk from cte1 ) select tag,min(v_start)v_start,max(v_stop)v_stop from cte2 group by tag,rnk order by tag
tag
v_start
v_stop
a
2
7
a
8
14
b
7
10
b
12
15
c
10
11
SELECT 5