SQL加入问题

Question

我正在尝试将几个表连接在一起，其中一个表是同一个表中的相同连接，具有不同的条件。我在查询中获得输出，但不是在一个统一的行上。例如：

    select distinct  rfp.id, title, bidtype, rfp.createdon as '#1', s.finishedDt as '#2', c.id as 'Contract #', supp.rfp_contr_supplier_name, es.suppdate as '#3', es2.suppdate as '#4'
  from TBL_RFP_Ideas_NEW rfp
left join tbl_rfp_senior s on rfp.id = s.ideaid
left join rfp_contract c on rfp.id = c.ideaid
inner join supplier_view supp on contractnbr = c.id
left join TBL_EmpMaster_Full emp on rfp.sponsor_empid = emp.empid
left join rfp_events e on rfp.id = e.ideaid
left join rfp_events_suppliers es on e.id = es.event_id and e.heading = '4' and e.description = 'Master Agreement effective date'
left join rfp_events_suppliers es2 on e.id = es2.event_id and e.heading = '5' and e.description = 'Master Agreement Rollout date'
where rfp.id = '683311'
group by rfp.id, title, bidtype, rfp.createdon, s.finishedDt, c.id, supp.rfp_contr_supplier_name, es.suppdate, es2.suppdate, e.description

如果需要，我可以详细说明表架构，但是连接几乎可以解释它是如何构建的。我希望我错过了一些非常小的东西。任何帮助表示赞赏！

Answer 1

正在发生多行，因为tbl_rfp_senior中有3条记录与该ID匹配，并且rfp_events中可能还有3条记录（没有数据很难分辨。您需要添加其他条件你的连接消除多余的行（例如，deactivation_date不是空的？或者active = 1是一些想法）或使用min和max或其他一些像sum这样的聚合来获得感兴趣的单个结果并从分组中删除这些字段.I还会建议，如果存在distinct和group by，则存在代码气味： - ）

为了帮助调试此问题，我首先选择*并删除组，并确定多行来自何处​​以及需要进行聚合的位置。

Answer 2

select distinct  
        rfp.id, title, bidtype, rfp.createdon as '#1', s.finishedDt as '#2', c.id as 'Contract #', supp.rfp_contr_supplier_name, es.suppdate as '#3', es2.suppdate as '#4'
from 
        TBL_RFP_Ideas_NEW rfp
        left join 
        (
            Select  distinct    ideaid,finishedDt
            From    tbl_rfp_senior
        )s 
        on rfp.id = s.ideaid
        left join 
        rfp_contract c 
        on rfp.id = c.ideaid
        inner join 
        supplier_view supp 
        on contractnbr = c.id
        left join 
        TBL_EmpMaster_Full emp 
        on rfp.sponsor_empid = emp.empid
        left join 
        rfp_events e 
        on rfp.id = e.ideaid
        left join 
        rfp_events_suppliers es 
        on e.id = es.event_id and e.heading = '4' and e.description = 'Master Agreement effective date'
        left join
        rfp_events_suppliers es2 
        on e.id = es2.event_id and e.heading = '5' and e.description = 'Master Agreement Rollout date'
where rfp.id = '683311'
group by rfp.id, title, bidtype, rfp.createdon, s.finishedDt, c.id, supp.rfp_contr_supplier_name, es.suppdate, es2.suppdate, e.description