MySql：从两个表中获取数据，并按日期分组

Question

我有两个表几乎相同的列，我想合并它们并按日期分组

表1：order_payments_detail

| payment_by |  amount( as Debit in result) | added_on     |
| Ali        |   1000                       | 2014-09-21   |
| Aslam      |   2000                       | 2014-09-25   |
| Akram      |   4000                       | 2014-09-28   |

表2：订单

| cust_name  |  amount( as credit in result)| added_on     |
| Shop1      |   1000                       | 2014-09-22   |
| Shop2      |   2000                       | 2014-09-26   |
| Shop3      |   4000                       | 2014-09-29   |

结果将是这样的

| particulars|  debit  |  credit | added_on     |
| Ali        |   1000  |  null   | 2014-09-21   |
| Shop1      |   null  |  1000   | 2014-09-22   |
| Aslam      |   2000  |  null   | 2014-09-25   |
| Shop2      |   null  |  2000   | 2014-09-26   |
| Akram      |   4000  |  null   | 2014-09-28   |
| Shop3      |   null  |  4000   | 2014-09-29   |

Answer 1

您可以使用union all：

轻松完成此操作

select payment_by, amount as debit, NULL as credit, added_on
from order_payments_detail
union all
select cust_name, NULL, amount, added_on
from orders
order by added_on;

按“按日期分组”，我认为你的意思是“按日期排序”。