WITH cte AS (
			SELECT		*
			FROM		(VALUES
						(0,10),
						(10,20),
						(20,30),
						-- пробел (30-40)
						(40,50),
						(50,60),
						(60,70),
						-- пробел (70-90)
						(90,100),
						(100,110),
						(110,120),
						-- пробел (120-150)
						(150,160),
						(160,170)) AS foo("start", "end"))
SELECT		"start",
			"end"
FROM		(
			SELECT		*,
						LAG("end") OVER(ORDER BY "start") AS p,
						LEAD("start") OVER(ORDER BY "end") AS n
			FROM		cte) AS a
WHERE		"start" <> p
			OR "end" <> n;