Presto SQL - How can i get all possible combination of an array?
问题 I want all the possible combination of a number in a given set of array. I tried using some of the predefined functions of presto like array_agg(x) Input : [1,2,3,4] Output when n=2 : [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]] when n=3 : [[1,2,3],[1,2,4],[1,3,4],[2,3,4]] when n=4 : [[1,2,3,4]] or [1,2,3,4] 回答1: There is combinations(array(T), n) function and it does exactly what you want: select combinations(array[1,2,3,4],2); 来源: https://stackoverflow.com/questions/56540393/presto-sql-how-can-i