kurtSamp

CREATE TABLE test_data (x Float64) ENGINE = Memory;
INSERT INTO test_data VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10);

SELECT kurtSamp(x) FROM test_data;

┌────────kurtSamp(x)─┐
│ 1.4383636363636365 │
└────────────────────┘