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CREATE TABLE t AS SELECT 1 AS n, 1 AS value UNION ALL SELECT 2,4 UNION ALL SELECT 3,4 UNION ALL SELECT 4,6 UNION ALL SELECT 5,4 UNION ALL SELECT 6,8;
SELECT 6
SELECT t.*, (sort(ARRAY_AGG(t.value) OVER(ORDER BY t.n), 'desc'))[2] AS sec_max FROM t ORDER BY n;
n
value
sec_max
1
1
null
2
4
1
3
4
4
4
6
4
5
4
4
6
8
6
SELECT 6