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GROUP_CONCAT(value, \" \") from test;\n+----------------------------+\n| GROUP_CONCAT(`value`, ' ') |\n+----------------------------+\n| a b c c |\n+----------------------------+\n\nmysql> select GROUP_CONCAT(value, NULL) from test;\n+----------------------------+\n| GROUP_CONCAT(`value`, NULL)|\n+----------------------------+\n| NULL |\n+----------------------------+\n\nSELECT abs(k3), group_concat(distinct cast(abs(k2) as varchar) order by abs(k1), k5) FROM bigtable group by abs(k3) order by abs(k3); +------------+-------------------------------------------------------------------------------+\n| abs(`k3`) | group_concat(DISTINCT CAST(abs(`k2`) AS CHARACTER), ORDER BY abs(`k1`), `k5`) |\n+------------+-------------------------------------------------------------------------------+\n| 103 | 255 |\n| 1001 | 1989, 1986 |\n| 1002 | 1989, 32767 |\n| 3021 | 1991, 32767, 1992 |\n| 5014 | 1985, 1991 |\n| 25699 | 1989 |\n| 2147483647 | 255, 1991, 32767, 32767 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