MYSQL - 獲取具有一個組的查詢中的特定值的計數

Question

我試圖獲取某個值在列中出現的次數，但只有在組被by'd過後才顯示。我會在下面解釋 -

這個查詢得到我這些結果 -

select id_seed, id_campaign, id_chat from messages where id_campaign = 140 group by id_chat; 
+------------+-------------+----------------------------------------+ 
| id_seed | id_campaign | id_chat        | 
+------------+-------------+----------------------------------------+ 
| 4102593936 |   140 | 0d60b2a4a79938b07ac39b977a96efc4CCC140 | 
| 4102593936 |   140 | 1118cb4436f5e5d03f4805d0b9e8bf3eCCC140 | 
| 4075174669 |   140 | 12d59be001fc6d795c2da5f9456b41afCCC140 | 
| 4102593936 |   140 | 2032e80ca46bca4a5d97f2da92e9f7b1CCC140 | 
| 4102593936 |   140 | a6ab87684aa1a90dff7ea61cf618d3f9CCC140 | 
| 4075174669 |   140 | ace48ab48c4409e6307a2dc55856ce72CCC140 | 
| 4075174669 |   140 | d09d4cf87e5d8b2c3efcfea1fd94f9eaCCC140 | 
| 4102593936 |   140 | d2f5fc4c1d7d9d95cfd4846234f6aad3CCC140 | 
| 4102593936 |   140 | d5b6712b51878a2f37e7004bc5b57171CCC140 | 
+------------+-------------+----------------------------------------+ 

我幾乎什麼，我這裏尋找，但由於某種原因，它不加在一起。

select distinct count(id_seed) as c, id_seed from messages where id_campaign = 140 group by id_chat, id_seed; 
+---+------------+ 
| c | id_seed | 
+---+------------+ 
| 1 | 4075174669 | 
| 5 | 4102593936 | 
| 1 | 4102593936 | 
| 2 | 4075174669 | 

我想知道在group by之後每個值出現在id_seed列內多少次。我很近，而且相當遠，但仍然卡住了。任何線索？

Answer 1

SELECT 
    COUNT(*), 
    id_seed 
FROM 
    (
     select 
      id_seed 
     from 
      messages 
     where 
      id_campaign = 140 
     group by 
      id_chat 
    ) 
GROUP BY 
    id_seed