Question

我试图从我的两个表中选择特定的列，其中一个是派生表，但出于某种原因我只能选择*

这有效：

SELECT *        
FROM        
    (

--Pivot the Custom Fields into a derived table--------------

        SELECT  [Id], [CustomField], [CustomField2], [CustomField3], [CustomField4], [CustomField5]
        FROM
                (
                    SELECT [Id], [FieldValue], [FieldName]    
                    FROM 
                    EntityCustomFieldValues 
                    AS t1
                    INNER JOIN Contact t2 ON t1.ParentId = t2.Id
                 )AS SourceTable 

                    PIVOT
                    (
                    MAX([FieldValue]) FOR [FieldName] IN ([CustomField], [CustomField2], [CustomField3], [CustomField4], [CustomField5])
                    )AS PivotTable

-----------------------------------------------------------
     ) AS t

    INNER JOIN Contact ON t.Id = Contact.Id

问题是，一旦我尝试选择特定列，我会收到语法错误???

    SELECT  [t].[Id], [Contact].[FirstName], [t].[CustomField], [t].[CustomField2],         
FROM        
    (

--Pivot the Custom Fields---------------------------------

        SELECT  [Id], [CustomField], [CustomField2], [CustomField3], [CustomField4], [CustomField5]
        FROM
                (
                    SELECT [Id], [FieldValue], [FieldName]    
                    FROM 
                    EntityCustomFieldValues 
                    AS t1
                    INNER JOIN Contact t2 ON t1.ParentId = t2.Id
                 )AS SourceTable 

                    PIVOT
                    (
                    MAX([FieldValue]) FOR [FieldName] IN ([CustomField], [CustomField2], [CustomField3], [CustomField4], [CustomField5])
                    )AS PivotTable

----------------------------------------------------
     ) AS t

    INNER JOIN Contact ON t.Id = Contact.Id;

第15行，第1行，第4行   关键字＆＃39; FROM＆＃39;。
附近的语法不正确
第15行，第15行，第1行，第25行   关键字＆＃39; AS＆＃39;附近的语法不正确。

我试图将其包装在另一个选择中，但这也不起作用。

Answer 1

试试这个：

SELECT [t].[Id]
    ,[Contact].[FirstName]
    ,[t].[CustomField]
    ,[t].[CustomField2]
FROM (
    --Pivot the Custom Fields---------------------------------
    SELECT [Id]
        ,[CustomField]
        ,[CustomField2]
        ,[CustomField3]
        ,[CustomField4]
        ,[CustomField5]
    FROM (
        SELECT [Id]
            ,[FieldValue]
            ,[FieldName]
        FROM EntityCustomFieldValues AS t1
        INNER JOIN Contact t2 ON t1.ParentId = t2.Id
        ) AS SourceTable
    PIVOT(MAX([FieldValue]) FOR [FieldName] IN (
                [CustomField]
                ,[CustomField2]
                ,[CustomField3]
                ,[CustomField4]
                ,[CustomField5]
                )) AS PivotTable
    ----------------------------------------------------
    ) t
INNER JOIN Contact ON t.Id = Contact.Id;

Answer 2

请试试这个：

    SELECT  [t].[Id], [Contact].[FirstName], [t].[CustomField], [t].[CustomField2]
    FROM        
    (

--Pivot the Custom Fields---------------------------------

        SELECT  [Id], [CustomField], [CustomField2], [CustomField3], [CustomField4], [CustomField5]
        FROM
                (
                    SELECT [Id], [FieldValue], [FieldName]    
                    FROM 
                    EntityCustomFieldValues t1
                    INNER JOIN Contact t2 ON t1.ParentId = t2.Id
                 ) SourceTable 

                    PIVOT
                    (
                    MAX([FieldValue]) FOR [FieldName] IN ([CustomField], [CustomField2], [CustomField3], [CustomField4], [CustomField5])
                    ) PivotTable

----------------------------------------------------
     ) t

    INNER JOIN Contact ON t.Id = Contact.Id;

从两个表中选择列（一个派生） - 内部联接

2 个答案: