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A
aid , other fields
B
bid , other fields
c
cid , other fields
a.aid = b.bid and a.aid = c.cid
A
aid , other fields
B
bid , aid , other fields
c
cid , bid , other fields
a.aid = b.aid and b.bid = c.bid
再加一coment
comment 表 (id,a.id,b.id,c.id 等...)