能帮上忙吗?
select (SELECT group_concat(DISTINCT a) FROM my_table) as a,(SELECt group_concat(DISTINCT b) FROM my_table) as b,(SELECt group_concat(DISTINCT c) FROM my_table) as c,(SELECt group_concat(DISTINCT d) FROM my_table) as d

能帮上忙吗?
select (SELECT group_concat(DISTINCT a) FROM my_table) as a,(SELECt group_concat(DISTINCT b) FROM my_table) as b,(SELECt group_concat(DISTINCT c) FROM my_table) as c,(SELECt group_concat(DISTINCT d) FROM my_table) as d