查詢獲得每週平均花費每個客戶

Question

我有問題.. 我有這樣的數據庫大多是這樣的， 我怎麼能得到每個客戶每週平均花費？你能告訴我這個SQL查詢嗎？

這裏的例子

| customer | spending | date    | 
| -----------|----------|---------------------| 
| customer A |  105 | 2016-03-02 11:24:38 | 
| customer A |  75 | 2016-02-02 11:24:38 | 
| customer B |  35 | 2016-03-02 11:24:38 | 
| customer A |  40 | 2016-03-02 11:24:38 | 
| customer B |  105 | 2016-02-15 11:24:38 | 
| customer A |  100 | 2016-03-02 11:24:38 | 
| customer A |  150 | 2016-02-21 11:24:38 | 
| customer A |  139 | 2016-03-02 11:24:38 | 

更多...

任何人都可以幫我嗎？感謝

Answer 1

嘗試在一年的客戶和星期的組合使用GROUP BY：

SELECT customer, WEEK(date), AVG(spending) 
FROM sales 
GROUP BY customer, WEEK(date)