mysql 如果把多个搜索的结果合并成多个列？

select tmp.t1,tmp.t2

from

(select 字段名 as t1,null as t2

from 表名)

union

(select null as t1,字段名 as t2

from 表名

)tmp

您好.以前有高人写过类似的:select id,group_concat(re_id order by re_id separator ",") as re_idfrom tablenamegroup by id方法2：select group_concat(list_name) from aa_list如果还有问题，可以继续追问，感谢。

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