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Mysql如何查询数据关联?
select * from 表名 where toId in(select fromId from 表名 where toId = 3) or toId = 3或select * from 表名 where toId in((select
select * from 表名 where toId in(select fromId from 表名 where toId = 3) or toId = 3或select * from 表名 where toId in((select