MySQL:"where子句中的未知列"在更新声明中 [英] MySQL: "Unknown column in where clause" during Update Statement

问题描述

UPDATE Recipes RE, (
    SELECT SUM((((i.iCaseCost/i.iCaseQty)/i.iUnitSize)/i.iUnitSoldBy)*ri.riQty*ri.riMeasureBy) AS     'RecipeCost'
      FROM Recipes r INNER JOIN RecipeIngredients ri
        ON r.rID = ri.rID JOIN Ingredients i
        ON ri.iID = i.iID 
        WHERE ri.rID = RE.rID
    ) t
    SET RE.rYieldCost = t.RecipeCost

执行时，出现以下错误:'where子句'中的未知列'RE.rID'".

When executed, I get the following error: "Unknown column 'RE.rID' in 'where clause'".

有什么想法吗?

推荐答案

内部派生查询对外部查询中的列一无所知.尝试使用WHERE t.rID = RE.rID之类的东西将WHERE移到UPDATE子句中.

Your inner derived query doesn't know anything about columns in the outer query. Try moving the WHERE into the UPDATE clause with something like WHERE t.rID = RE.rID.

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