Q&A for experienced flyers, pilots, and builders of drones and model aircraft
CREATE TABLE #table( ID int ); INSERT INTO #table VALUES (4), (5), (10); SELECT TOP 1 t1.Id+1 as ID FROM #table t1 WHERE NOT EXISTS(SELECT * FROM #table t2 WHERE t2.Id = t1.Id + 1) ORDER BY t1.Id DROP TABLE #table;