功能在联合查询中的虚拟列

Question

我是新来的sql，我需要一点帮助。我有一个union查询与3个表。我有一个虚拟列，所以我可以告诉每一行来自哪个表。我希望能够过滤此虚拟列以仅显示特定表中的行。

我使用Microsoft Access，这是我到目前为止有：

SELECT Table1 as Table_Name, Table1.1 
FROM Table1 
UNION ALL 
SELECT Table2 as Table_Name, Table2.1 
FROM Table2 
UNION ALL 
SELECT Table3 as Table_Name, Table3.1 
FROM Table3 
UNION ALL 
WHERE Table_Name = Form1.TextBox 
ORDER BY Table1.1; 

我想这样的形式链接到一个列表框，然后有一些textboxs筛选结果。

Answer 1

如何：

SELECT * FROM 
(SELECT Table1 as Table_Name, Table1.1 
FROM Table1 
UNION ALL 
SELECT Table2 as Table_Name, Table2.1 
FROM Table2 
UNION ALL 
SELECT Table3 as Table_Name, Table3.1 
FROM Table3) q 
WHERE Table_Name = Forms!Form1!TextBox 
ORDER BY Table1.1; 

参见：http://access.mvps.org/access/forms/frm0031.htm