多列子查詢不適用於笛卡爾積

SELECT 
    daf.id as affiliate_id, 
    daf.name as affiliate_name, 
    dal.name as allocation_name, 
    dal.id as allocation_id, 
    dal.allocation,dal.price 
FROM 
    degreeamerica.affiliates daf,degreeamerica.allocations dal 
JOIN 
    (select pap.lead_price,pap.live from paul.affiliates_price pap) pafp 
ON (dal.id=pafp.allocation_id and daf.id=pafp.affiliate_id) 
ORDER BY daf.id;

未知列pafp.allocation_id。我有這個專欄。但它不工作。請幫忙。多列子查詢不適用於笛卡爾積

來源

2015-07-01 Abdul Moiz

不要在'from'子句中使用逗號。總是使用明確的「連接」（即使是「交叉連接」）。這將解決您的問題。 –

您在子查詢 –

'（從paul.affiliates_price pap選擇pap.lead_price，pap.live，allocation_id，affiliate_id）'沒有該列以修復 – cske

看起來你的子查詢中沒有選擇「allocation_id」列。在子查詢選中的列中添加此列並進行檢查。

SELECT 
    daf.id as affiliate_id, 
    daf.name as affiliate_name, 
    dal.name as allocation_name, 
    dal.id as allocation_id, 
    dal.allocation,dal.price 
FROM 
    degreeamerica.affiliates daf,degreeamerica.allocations dal 
JOIN 
    (select pap.lead_price,pap.live, allocation_id from paul.affiliates_price pap) pafp 
ON (dal.id=pafp.allocation_id and daf.id=pafp.affiliate_id) 
ORDER BY daf.id;

來源

2015-07-01 16:42:37 Shankar

多列子查詢不適用於笛卡爾積

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