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分享select a.username,b.username,c.title
from dx_message c
left join dx_user a on a.id = c.user_id1
left join dx_user b on b.id = c.user_id2
select b.username,c.username,a.title from Dx_Message a,Dx_User b,Dx_User c
where a.User_ID1=b.id and a.User_ID2=c.id and id=....