Question

我在加入时遇到麻烦。基本上，我只需要知道两个表中是否都存在“仓库”，而只需获取两个日期之间所需“仓库”的最后一个条目即可。

Select c.warehouse, p.id, p.status FROM control c LEFT JOIN payment p ON c.warehouse = p.warehouse WHERE p.date BETWEEN '2018-06-26' AND '2018-06-27'

我也尝试过（它说：组功能的无效使用）：

Select c.warehouse, p.id, p.status FROM control c LEFT JOIN payment p ON c.warehouse = p.warehouse WHERE p.date BETWEEN '2018-06-26' AND '2018-06-27' && p.id = MAX(p.id)

这些是我的桌子

                              payments                       control
             +---------------------------------------+    +-----------+
             | id  |  warehouse  | status |   date   |    | warehouse |
             +---------------------------------------+    +-----------+
             |19006|    226975   |   DUE  |2018-06-26|    |   226975  |
    MAX ID-> |19066|    226975   |   PAID |2018-06-27|    |   226976  |
             +---------------------------------------+    +-----------+


      Result Obtained:
+--------------------------------------+
| warehouse |  id  | status |   date   |
+--------------------------------------+
|  226975   |19006 |  DUE   |2018-06-26|
+--------------------------------------+
In this case I'm obtaining the "first entry", the lower one (id: 19006) and I want "the last" (id: 19066) the max.

      Result expected:
+--------------------------------------+
| warehouse |  id  | status |   date   |
+--------------------------------------+
|  226975   |19066 |  PAID  |2018-06-27|
+--------------------------------------+

有什么想法吗？预先感谢。

Answer 1

两个要求。

在两个表中的warehouse列中都行。排除其他人。这是通过内部JOIN完成的。
payments表中的最新条目。可以使用此子查询检索每个id的最新条目的warehouse。
```
  SELECT MAX(id) id, warehouse 
    FROM payments
   GROUP BY warehouse
```

将它们放在一起：

  SELECT p.warehouse, p.id, p.status, p.date
    FROM payments p
    JOIN ( SELECT MAX(id) id, warehouse 
             FROM payments
            GROUP BY warehouse
         ) mm ON p.id = mm.id AND p.warehouse = mm.warehouse
    JOIN control c ON p.warehouse = c.warehouse

Answer 2

我的版本与O. Jones略有不同。

SELECT *
FROM control c
LEFT JOIN payments p ON p.warehouse=c.warehouse AND
                        p.date = (SELECT MAX(p1.date) 
                                  FROM payments p1 
                                  WHERE p1.warehouse=c.warehouse)
WHERE p.date IS NOT NULL;

MySQL在两个日期之间加入MAX ID

2 个答案: