MySQL的子查詢仍然會產生兩倍的SUM值

我確定我做錯了什麼，因爲我已經遵循了所有發現的例子。我確實得到了結果，但總數翻倍或大量複製總數。MySQL的子查詢仍然會產生兩倍的SUM值

查詢是：

select 

(st.total_cells) as 'Cells Sorted', 

from abstract_freeze af 
left join abstract_ejaculate_collection aec on af.ejaculate_collection_id = aec.id 
left join mo_flo on aec.id = mo_flo.ejaculate_collection_id 
left join sample_time st on mo_flo.id = st.mo_flo_id 
left join collection_schedule cs on aec.collection_schedule_id = cs.id 
left join collection_plan cp on cs.collection_plan_id = cp.id 
left join sub_admission sa on cp.sub_admission_id = sa.id 
left join master_admission ma on sa.master_admission_id = ma.id 
left join animal on ma.animal_id = animal.id 
where aec.tenant_id = 8 and date(aec.scheduled) = '2017-04-12' and sa.type = 'Sexed' 
group by aec.id;

將有多個abstract_freeze記錄與同ejaculate_collection_id，爲此我SUM基於重複af.ejaculate_collection_id的數量（st.total_cells）重複。

我可以似乎得到我的查詢或子查詢正確的，我需要基於分組total_cells的總和。

來源

2017-04-20 Casy Choate

我沒有看到任何地方發生的金額。這是你的整個查詢嗎？ –

對不起，我刪除了一些行來縮短它，因爲我專注於「單元排序」，但它應該讀取SUM（st.total_cells）。我的錯。 –

如果你有多個記錄每id，那麼你可能會想SUM每id並不僅僅是總，你可以試試這個：

select aec.id, SUM(st.total_cells) as 'Cells Sorted', 
from abstract_freeze af 
left join abstract_ejaculate_collection aec on af.ejaculate_collection_id = aec.id 
left join mo_flo on aec.id = mo_flo.ejaculate_collection_id 
left join sample_time st on mo_flo.id = st.mo_flo_id 
left join collection_schedule cs on aec.collection_schedule_id = cs.id 
left join collection_plan cp on cs.collection_plan_id = cp.id 
left join sub_admission sa on cp.sub_admission_id = sa.id 
left join master_admission ma on sa.master_admission_id = ma.id 
left join animal on ma.animal_id = animal.id 
where aec.tenant_id = 8 and date(aec.scheduled) = '2017-04-12' and sa.type = 'Sexed' 
group by aec.id;

來源

2017-04-20 16:02:28

好了，所以實際上不得不之前加入總結。結束了這一點，它的工作得到正確的價值觀：

LEFT JOIN (SELECT tc.mo_flo_id, SUM(tc.total_cells) AS cells FROM sample_time tc GROUP BY mo_flo_id) tc USING (mo_flo_id)

然後...

tc.cells AS 'Cells Sorted'

得到適當的彙總值。

感謝大家的幫助。

來源

2017-04-20 19:58:48

MySQL的子查詢仍然會產生兩倍的SUM值

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