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    Why this is faling but output is correct

    SET SESSION group_concat_max_len = 1000000; WITH RECURSIVE numbers AS ( SELECT 2 AS n UNION ALL SELECT n + 1 FROM numbers WHERE n + 1 <= 1000 ) SELECT GROUP_CONCAT(n SEPARATOR '&') AS prime_numbers FROM numbers WHERE NOT EXISTS ( SELECT 1 FROM numbers AS d WHERE d.n < n AND d.n > 1 AND MOD(n, d.n) = 0 );