MySQL的統計重複行的值和不顯示重複的行名

Question

我有表STREAMS：

+----+----------+-------------------------------------------------------------+-------------+-------------+ 
| id | name  | stream              | server  | bouquet  | 
+----+----------+-------------------------------------------------------------+-------------+-------------+ 
| 1 | HOME  | ["http://ur11.com/", "http://ur12.com/"]     | ["1", "3"] | ["3","2"] | 
| 2 | HOME  | ["http://ur15.com/", "http://ur16.com/"]     | ["12", "13"] | ["31","12"] | 
+----+----------+-------------------------------------------------------------+-------------+-------------+ 

我有表看：

+----+--------+------------+---------+ 
| id | stream | month  | watched | 
+----+--------+------------+---------+ 
| 16 |  2 | 2017-02-01 |  1 | 
| 2 |  1 | 2017-01-01 |  3 | 
| 15 |  2 | 2017-01-01 |  4 | 
+----+--------+------------+---------+ 

，需要從查詢中得到這樣的：

+--------+------------+---------+ 
| stream | month  | watched | 
+--------+------------+---------+ 
|  2 | 2017-02-01 |  5 | 
|  1 | 2017-01-01 |  3 | 
+--------+------------+---------+ 

我嘗試使用：

SELECT DISTINCT stream, month, watched FROM watched; 

這個顯示全部沒有重複，但如何統計相同的流和顯示在監視？在例子中，你看到我們有2 - 1觀看流和2 - 4觀看流...我需要加在一起（1 + 4），並在表流2中顯示 - 看着5 ..但我只得到第一流清晰..我嘗試計數，但它顯示我重複....我需要組？

Answer 1

這產生你想要的輸出。這是你正在嘗試做什麼？

select stream, max(month) as month, sum(watched) as watched 
from watched 
group by stream;