從三個表中選擇查詢

Question

我有客戶，活動，交易和事實表2。我寫了一個查詢，如下所示

SELECT id,
(select customer.name from customer where customer.id = facts2.customer_id) 
  AS Customername,
(select campaign.name from campaign where campaign.id = facts2.campaign_id) 
  AS Campaignname,
(select deal.name from jb_deal where deal.id = facts2.deal_id) 
  AS Dealname,
revenue 
from facts2; 

+--------------+-------------+-------------------+----------+
    | Customername | Campaignanme |  Dealname         |  revenue |
    +-------------+-------------+-------------------------------+
    |           A |       Camp1 |               Deal1 |   100  |
    |           A |       Camp1 |               Deal2 |   200  | 
    |           A |       Camp2 |               Deal3 |   300  |
    |           B |       CampB |              DealB1 |   100  |
    |           B |       CampB |              DealB2 |   200  |
    |           C |       CampC |               Deal3 |   300  |
    +-------------+-------------+--------------------------------+

我想顯示sql表，而無需重復客戶名稱和活動名稱，如下所示。

+--------------+-------------+-------------------+----------+
    | customername | campaignanme | dealname         |  Revenue |
    +-------------+-------------+-------------------------------+
    |           A |       Camp1 |               Deal1 |   100  |
    |             |             |               Deal2 |   200  | 
    |             |       Camp2 |               Deal3 |   300  |
    |           B |       CampB |              DealB1 |   100  |
    |             |             |              DealB2 |   200  |
    |           C |       CampC |               Deal3 |   300  |
    +-------------+-------------+--------------------------------+

Answer 1

您將無法像這樣使它仍然可以使用UNION進行不同的輸入。 如果您願意，您可以像這樣

SELECT `result`.`Customername`,`result`.`Campaignname`,
GROUP_CONCAT(`result`.`Dealname`) AS `Dealname`,SUM(`revenue`) AS `revenue` FROM (SELECT id,
(select customer.name from customer where customer.id = facts2.customer_id) 
  AS Customername,
(select campaign.name from campaign where campaign.id = facts2.campaign_id) 
  AS Campaignname,
(select deal.name from jb_deal where deal.id = facts2.deal_id) 
  AS Dealname,
revenue 
from facts2) AS `result` GROUP BY `result`.`Campaignname`,`result`.`Customername`; 

結果將是這樣的

+--------------+-------------+-------------------+----------+
| Customername | Campaignanme |  Dealname        |  revenue |
+-------------+-------------+-------------------------------+
|           A |       Camp1 |         Deal1,Deal2 |   300  |
|           A |       Camp2 |               Deal3 |   300  |
|           B |       CampB |       DealB1,DealB2 |   300  |
|           C |       CampC |               Deal3 |   300  |
+-------------+-------------+--------------------------------+