Question

我有这个查询，

            (SELECT
            [NAME],
            [NAME] AS RESULT, 
            ' - ' AS VALUE, 
            0 AS ORDERING 
            FROM 
            [PARTY_MSTR] 
            UNION ALL 
            (SELECT 
            [PARTY_MSTR].[NAME], 
            '  - ' || [T1].[T_NAME], 
            (SELECT [T2].[T_NAME],
            SUM(COALESCE([T2].[VALUE1], 0)) +  FROM [T2] 
            CROSS JOIN [T1] ON [T1].[T_NAME] = [T2].[T_NAME] 
            GROUP BY [T2].[T_NAME]), 
            1 
            FROM 
            [PARTY_MSTR] 
            CROSS JOIN [T1] 
            ) AS X;

当我运行此查询时，我收到此错误SELECTs to the left and right of UNION ALL do not have the same number of result columns

现在我删除了评论，第二个错误来自only a single result allowed for a SELECT that is part of an expression。这个查询出了什么问题。我正在使用SQLite数据库。

Answer 1

根据评论，联盟左边有四个字段，右边有五个字段。

联合右侧的子选择返回多行。这就是你得到第二个错误的原因。

...请编辑你的代码，以便那里只有SQL。

Answer 2

解决了它。

        (SELECT
        [NAME],
        [NAME] AS RESULT, 
        ' - ' AS VALUE, 
        0 AS ORDERING 
        FROM 
        [PARTY_MSTR] 
        UNION ALL 
        SELECT 
        [PARTY_MSTR].[NAME], 
        '  - ' || [T1].[T_NAME], 
        (SELECT VALUE FROM ((SELECT [T2].[T_NAME],
        SUM(COALESCE([T2].[VALUE1], 0)) AS VALUE  FROM [T2] 
        CROSS JOIN [T1] ON [T1].[T_NAME] = [T2].[T_NAME] 
        GROUP BY [T2].[T_NAME]) AS Y)), 
        1 
        FROM 
        [PARTY_MSTR] 
        CROSS JOIN [T1] 
        ) AS X;

UNION ALL语句中列的不匹配

2 个答案: