如何在表格中添加列？

Question

我想添加两个表。但是我应该如何区分哪个条目来自哪个表？

表1

col1 
-----
a
b
c

表2

1
2
3

结果应为：

col1 tablename
----------------
a     table1
b      "
c      "
d     table2
e      "
f      "

Answer 1

Select Table1.Col1, "Table1" as 'TableName'
From dbo.Table1

Union all

Select Table2.Col1, "Table2" as 'TableName'
From dbo.Table2