如何用UNION结果选择表名？

Question

以下是UNION的结果，但我也想知道与每行关联的源表：

SELECT City FROM Customers
UNION
SELECT City FROM Suppliers
ORDER BY City;

查询的实际结果如下：

  

城市
  572个
  123

但我反而喜欢这个结果：

  

city tablet_result
  572客户
  123供应商

Answer 1

SELECT City, 'Customers' as tablet_result FROM Customers
UNION
SELECT City, 'Suppliers' as tablet_result FROM Suppliers

Answer 2

好的，试试：

SELECT City,'Customers' as tblName FROM Customers
UNION
SELECT City,'Suppliers' as tblName FROM Suppliers
ORDER BY City;

按照订单玩。

还要考虑做一个UNION ALL。有关差异，请参阅this。