mysql GROUP BY 字符相加

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SELECT GROUP_CONCAT(a)
FROM (
SELECT 'a' AS a,1 AS b,2 AS c
UNION ALL
SELECT 'b' AS a,1 AS b,2 AS c
UNION ALL
SELECT 'd' AS a,1 AS b,2 AS c
UNION ALL
SELECT 'd' AS a,1 AS b,2 AS c
UNION ALL
SELECT 'e' AS a,1 AS b,4 AS c
) AS bb

GROUP BY b,c

查询结果

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