竞价排名调用后 头像显示问题

用的这句：        SELECT * FROM `homedata_show` ORDER BY credit DESC


可调用字段只有这么几个，请问  头像是怎么调用出来的？？？？       
字段名          数据实例
uid         *
username         *
credit         *
note          *

用下面的SQL

1. select sf.*,s.credit as credit from homedata_space sf left join homedata_show s on s.uid=sf.uid where sf.avatar=1 ORDER BY s.credit DESC,sf.dateline DESC

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