sql关联问题ABC三个表，

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select A.*,B.*,C.* from Aleft join B on A.id = B.aidleft join C on A.id = B. a2id

select A.*,B.*,C.* from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.*,B.*,C.* from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.*,B.*,C.* from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.name as aname,B.name as bname,C.name as cname from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.*,B.*,C.* from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.name as aname,B.name as bname,C.name as cname from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.*,B.*,C.* from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

select A.name as aname,B.name as bname,C.name as cname from Aleft join B on A.id = B.aidleft join C on A.id = C.a2id

这个建议你看一下：http://doc.thinkphp.cn/manual/continuous_operation.html

这个建议你看一下：http://doc.thinkphp.cn/manual/continuous_operation.html

$user = M('A');
$user->join("left join B on A.id=B.Id left join C on c.id=b.id")->field("A.id as aid,B,id as bid,……")->select();

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