2013-08-06 46 views
-4

我得到錯誤#1054 - 未知列'e.ProjectID「的條款」與下面的SQL#1054 - 未知列'e.ProjectID「的條款」

SELECT ProjectID 
FROM Project as p 
INNER JOIN (SELECT EquipID , EquipName , EquipTypeID , (EquipPrice*Quantity) As CstAmount  FROM Equipment) as e 
ON p.ProjectID=e.ProjectID 
+3

在子查詢中添加'ProjectID'。 –

+1

請制定一個實際的問題,與一段代碼相關,你也應該發佈 – bottleboot

+0

實際上你不需要子查詢,因爲你只需要'ProjectID'。 –

回答

0

你的子查詢沒有將該列暴露給外部查詢。

SELECT ProjectID 
FROM Project As p 
INNER 
    JOIN (
     SELECT ProjectID 
      , EquipID 
      , EquipName 
      , EquipTypeID 
      , (EquipPrice*Quantity) As CstAmount 
     FROM Equipment 
     ) As e 
    ON p.ProjectID = e.ProjectID 

不過,如果你只是想返回專案編號話,我建議你執行這個查詢,而不是:

SELECT ProjectID 
FROM Project 
WHERE EXISTS (
     SELECT * 
     FROM Equipment 
     WHERE ProjectID = Project.ProjectID 
     ) 
+0

爲什麼你需要子查詢?看着他的查詢,它看起來很簡單內部加入 – DevelopmentIsMyPassion

0

你不需要任何的子查詢。剛剛加入的項目表,設備表如下

SELECT p.ProjectID,e.EquipID ,e.EquipName ,e.EquipTypeID ,e.EquipPrice* e.Quantity as CstAmount from Project P join Equipment e on p.ProjectID=e.ProjectID 
0

,你可以做到這一點沒有子查詢

SELECT p.ProjectID ,e.EquipID , e.EquipName , e.EquipTypeID , (e.EquipPrice * e.Quantity) As CstAmount 
FROM Project as p 
INNER JOIN Equipment as e 
ON p.ProjectID= e.ProjectID 
+0

你會得到一個錯誤,因爲兩個表中都存在ProjectID。在SELECT中添加前綴 – Pascamel

0

什麼是你想怎麼辦?查詢可改寫像下面,但我懷疑這是你想要

SELECT p.ProjectID 
FROM Project as p 
INNER JOIN Equipment as e 
ON p.ProjectID = e.ProjectID 

你需要選擇你的子查詢的領域以及哪些?