Mysql 向列中添加一个值，该值指示记录来自哪个表+；sql

我有三个表（DocIncome、DocOutgoing和Financial），每个表的记录都有一个特定的ID和发生日期

我不是这方面的专家，但我写了一个查询，将我需要的所有信息都包含在一个输出中

   SELECT        [DepositNo],[ID], [Submitdate]
   FROM            [Doc_Income]
   WHERE        (DepositNo = 7081)

   UNION

   SELECT        [DepositNo],[ID], [TransferDate]
   FROM            [Doc_Outgoing]
   WHERE        (DepositNo = 7081)

   UNION

   SELECT            [Tansactions_Details].[DepositNo], [Transactions_Deposits].[ID], [Transactions_Deposits].[TransDate]
   FROM        [Tansactions_Details], [Transactions_Deposits]
   WHERE       [DepositNo]=7081 AND ([Tansactions_Details].[Ref_TransactionID] = [Transactions_Deposits].[ID])

   ORDER BY Submitdate

假设这是输出：

DepositNo|    ID    |  Date
  7081   |   7081   |  2006-10-28 00:00:00.000
  7081   |   21121  |  2006-10-28 00:00:00.000
  7081   |   21122  |  2006-11-21 00:00:00.000
  7081   |   21880  |  2008-03-16 16:41:27.000
  7081   |   23674  |  2008-10-14 11:13:58.000

但是，我如何表明记录1来自收入表？因为我需要代码中的信息

---

谢谢。

您可以在输出中添加自己的列，方法是提供一个文本字符串并按如下方式命名该列：

SELECT Col1, Col2, 'SomeText' AS MyColumn
FROM MyTable

SELECT        [DepositNo],[ID], [Submitdate], 'DocIncome' AS TableName
FROM            [Doc_Income]
WHERE        (DepositNo = 7081)

UNION

SELECT        [DepositNo],[ID], [TransferDate], 'DocOutgoing' AS TableName
FROM            [Doc_Outgoing]
WHERE        (DepositNo = 7081)

UNION

SELECT            [Tansactions_Details].[DepositNo], [Transactions_Deposits].[ID], [Transactions_Deposits].[TransDate], 'Doc_Income' AS TableName
FROM        [Tansactions_Details], [Financial]
WHERE       [DepositNo]=7081 AND ([Tansactions_Details].[Ref_TransactionID] = [Transactions_Deposits].[ID])

ORDER BY Submitdate

这使您的查询如下所示：

SELECT Col1, Col2, 'SomeText' AS MyColumn
FROM MyTable

SELECT        [DepositNo],[ID], [Submitdate], 'DocIncome' AS TableName
FROM            [Doc_Income]
WHERE        (DepositNo = 7081)

UNION

SELECT        [DepositNo],[ID], [TransferDate], 'DocOutgoing' AS TableName
FROM            [Doc_Outgoing]
WHERE        (DepositNo = 7081)

UNION

SELECT            [Tansactions_Details].[DepositNo], [Transactions_Deposits].[ID], [Transactions_Deposits].[TransDate], 'Doc_Income' AS TableName
FROM        [Tansactions_Details], [Financial]
WHERE       [DepositNo]=7081 AND ([Tansactions_Details].[Ref_TransactionID] = [Transactions_Deposits].[ID])

ORDER BY Submitdate

---

添加一个带有字符串的列，以在联合查询中标识表名，例如

SELECT        [DepositNo],[ID], [Submitdate], 'INCOME_TABLE' as TableName
   FROM            [Doc_Income]
   WHERE        (DepositNo = 7081)