列「PRODUCT_CODE」在where子句是曖昧

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SELECT rm_item_cost.product_code, SUM(rm_item_cost.cost) AS rm_cost, SUM(dm_item_cost.cost) AS dm_cost, SUM(labour_item_cost.cost) AS labour_cost, SUM(overheads_item_cost.cost) AS o_cost 
FROM rm_item_cost 
INNER JOIN dm_item_cost ON dm_item_cost.product_code = rm_item_cost.product_code 
INNER JOIN labour_item_cost ON labour_item_cost.product_code = dm_item_cost.product_code 
INNER JOIN overheads_item_cost ON overheads_item_cost.product_code = labour_item_cost.product_code 
WHERE product_code = 'CMRO-01'

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2017-09-14 irtza mazhar

消除歧義。否則，請參閱：[爲什麼我應該爲我認爲是非常簡單的SQL查詢提供一個MCVE？]（https://meta.stackoverflow.com/questions/333952/why-should-i-provide-an- mcve-for-what-looks-to-what-seems-to-very-simple-sql-query） – Strawberry

請問一個問題，不要只發布代碼 – Jens

[MySQL'user \ _id'可能重複在哪裏子句是不明確的問題]（https://stackoverflow.com/questions/2788326/mysql-user-id-in-where-clause-is-ambiguous-problem） –

你有miore比一列名爲您選擇表中product_code，所以你必須添加一個別名告訴MySQL你的意思是這列：

WHERE rm_item_cost.product_code = 'CMRO-01'

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2017-09-14 12:35:41 Jens

列「PRODUCT_CODE」在where子句是曖昧

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