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--语法上未看出有错误.
select a.* , m_customer.m_name from
(select jq_no, jq_cl,m_manufatory.m_name from jq_base,m_manufatory where jq_base.jq_manufatory=m_manufatory.m_no ) a
left join m_customer
on a.jq_cl=m_customer.m_no