如何連接兩個表按日期排序並按特定值限制每個表的結果？

Question

我有兩個表，並想加入這兩個表中的結果，但我在這裏的條件是：

 
Member Table 
+------+----------+--------+----------------------+ 
| a_id | name  | Active | Date     | 
+------+----------+--------+----------------------+ 
| 1 | Da Vinci | 1  | 2012-03-27 15:40:14 | 
| 2 | Monet | 0  | 2012-04-16 01:14:17 | 
| 3 | Van Gogh | 0  | 2012-03-22 15:49:59 | 
| 4 | Picasso | 1  | 2012-02-27 09:40:05 | 
| 5 | Renoir | 1  | 2012-04-22 15:40:14 | 
+------+----------+--------+----------------------+ 

Purchase Table 
+------+------+-------------------+---------------------+-------+ 
| a_id | p_id | title    | purchase date  | price | 
+------+------+-------------------+---------------------+-------+ 
| 1 | 1 | The Last Supper | 2012-03-27 15:40:14 | 34 | 
| 1 | 2 | The Mona Lisa  | 2012-04-27 15:40:14 | 87 | 
| 3 | 3 | Starry Night  | 2012-03-27 15:40:14 | 48 | 
| 3 | 4 | The Potato Eaters | 2012-03-27 15:40:14 | 67 | 
| 3 | 5 | The Rocks   | 2012-03-27 15:40:14 | 33 | 
| 5 | 6 | Les Deux Soeurs | 2012-04-30 15:40:14 | 64 | 
+------+------+-------------------+---------------------+-------+ 

從表上面我想找到2個最近活躍的成員（成員表）和他們的最後從購買表中購買1件。其結果應該是這樣的：

 
+------+------+-------------------+---------------------+-------+ 
| a_id | p_id | title    | purchase date  | price | 
+------+------+-------------------+---------------------+-------+ 
| 1 | 2 | The Mona Lisa  | 2012-04-27 15:40:14 | 87 | 
| 5 | 6 | Les Deux Soeurs | 2012-04-30 15:40:14 | 64 | 
+------+------+-------------------+---------------------+-------+ 

我試了幾個小時才找到這個問題的答案，但沒有找到任何解決辦法。請幫幫我。

感謝您的支持。

Answer 1

嘗試

SELECT a.a_id, p.p_id, p.title, p.purchase_date, p.price 
FROM Member a LEFT JOIN Purchase p ON a.a_id = p.a_id 
WHERE a.Active = 1 
ORDER BY a.Date DESC LIMIT 2 

變化

ORDER BY a.Date DESC 

到

ORDER BY a.Date DESC, p.purchase_date DESC