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DROP TABLE IF EXISTS #edges; CREATE TABLE #edges(tail int, head int); INSERT INTO #edges(tail,head) VALUES (0,1), (5, 6), (10,11), (15,16), (0,2), (5, 7), (10,12), (15,17), (1,2), (6, 7), (11,12), (16,17), (1,3), (7, 8), (11,13), (17,18), (2,3), (7, 9), (12,13), (17,19), (2,4), (8, 9), (12,14), (18,19), (3,4), (8,10), (13,14), (3,5), (9,10), (13,15), (4,5), (9,11), (14,15), (4,6), (14,16); WITH descendents(node) AS( SELECT 0 as node UNION ALL SELECT head as node FROM descendents as prior JOIN #edges ON prior.node = tail ) SELECT (SELECT COUNT(node) FROM descendents) as total_nodes, (SELECT COUNT(node) FROM (SELECT DISTINCT node FROM descendents) as d) as distinct_nodes
total_nodes
distinct_nodes
10512
20