从同一个表中加入同一列两次时出现模棱两可的错误

Question

我有以下查询，我需要将 account_manager 列 = 到 prod_id 以分配客户经理名称，并对 client_id = prod_id 执行相同操作以获取 producer_name。我为生产者表创建了别名，但继续得到列定义不明确的错误。

Select rg.group_number, rg.group_name, qo.quote_id, qo.effective_date, qo.quote_type, qo.hra_ind, rg.account_manager, a.name as account_manager_name, rg.client_id, name as producer_name
From qo_quote qo, 
     re_group rg
     
    JOIN producer a ON a.prod_id = rg.account_manager
    JOIN producer b ON b.prod_id = rg.client_id,

        ( select distinct a.group_number, c.prospect_nbr
          from re_current_benefits a, 
               qo_quote b,
               qo_account c
          where a.quote_id = b.quote_id and b.hra_ind = 'Y' and
                a.group_number = c.group_number and c.hcr_ind = '3'
        ) q1

Where q1.prospect_nbr = qo.prospect_nbr and 
      q1.group_number = rg.group_number and qo.effective_date = rg.renewal_date and
      qo.quote_type = 'B' and qo.quote_expiration_ind is null and qo.hra_ind is null and
      qo.mhs_lob_code not in ('DTL1', 'DTL2', 'VIS1')

Answer 1

当您加入具有相同列的表时，您必须从哪个表中找到每个不明确的列，目前您缺少name

b.name as producer_name