Mysql查询带范围的案例，以及带货币的案例

Posted 2023-02-24

【中文标题】Mysql查询带范围的案例，以及带货币的案例

【英文标题】：Mysql query case with range, and case with currency

【发布时间】：2013-06-13 09:00:06

【问题描述】：

我有一个表格“订单”，其中的列看起来像这样：

| order_id | shop_id | order_total | currency | created_at |

现在我想做一个查询，它返回一个如下所示的表：

| interval | currency | sum |

其中interval 是日期间隔，currency 是货币，sum 是该时间间隔内所有订单的总和，该货币。例如：

| 2012-08-12-2012-09-12 | EUR | 540922 |

| 2012-08-12-2012-09-12 | DKK | 43215  |

| 2012-09-12-2012-10-12 | EUR | 123643 |

| 2012-09-12-2012-10-12 | DKK | 0      |

我已经有一个不考虑货币的查询，但我不知道如何让它考虑货币.. 有什么想法吗？

这是我现在使用的查询示例。真正的查询当然是代码生成的，这只是一个例子。

SELECT CASE
         WHEN created_at BETWEEN '2012-08-12' AND '2012-09-12' THEN '2012-08-12-2012-09-12'
         WHEN created_at BETWEEN '2012-09-12' AND '2012-10-12' THEN '2012-09-12-2012-10-12'
         WHEN created_at BETWEEN '2012-10-12' AND '2012-10-14' THEN '2012-10-12-2012-10-14'
       end AS intrvl,
       Sum(order_total)
FROM   `order` o
WHERE  shop_id = 4
       AND created_at BETWEEN '2012-08-12' AND '2012-11-17'
GROUP  BY CASE
            WHEN created_at BETWEEN '2012-08-12' AND '2012-09-12' THEN '2012-08-12-2012-09-12'
            WHEN created_at BETWEEN '2012-09-12' AND '2012-10-12' THEN '2012-09-12-2012-10-12'
            WHEN created_at BETWEEN '2012-10-12' AND '2012-10-14' THEN '2012-10-12-2012-10-14'
          end  

/莫腾

【参考方案1】：

将货币添加到您的 select 和 group by 子句中

SELECT CASE
         WHEN created_at BETWEEN '2012-08-12' AND '2012-09-12' THEN '2012-08-12-2012-09-12'
         WHEN created_at BETWEEN '2012-09-12' AND '2012-10-12' THEN '2012-09-12-2012-10-12'
         WHEN created_at BETWEEN '2012-10-12' AND '2012-10-14' THEN '2012-10-12-2012-10-14'
       end AS intrvl,
       currency, 
       Sum(order_total)
FROM   `order` o
WHERE  shop_id = 4
       AND created_at BETWEEN '2012-08-12' AND '2012-11-17'
GROUP  BY CASE
            WHEN created_at BETWEEN '2012-08-12' AND '2012-09-12' THEN '2012-08-12-2012-09-12'
            WHEN created_at BETWEEN '2012-09-12' AND '2012-10-12' THEN '2012-09-12-2012-10-12'
            WHEN created_at BETWEEN '2012-10-12' AND '2012-10-14' THEN '2012-10-12-2012-10-14'
          end,
          currency

【讨论】：

好吧，这行得通，但现在我得到两行以 null 作为区间，因为它计算区间外的所有订单并将区间设置为空。有没有办法从查询？

只需确保您的 where 子句具有正确的 created_at 范围 - 它具有 2012-08-12 到 2012-11-17 但查询只查看到 2012-08-12 到 2012-10 的范围-14