的MySQL：檢索基於表2中值表3的結果標記，以表1

Question

表5：經理

id | name 
1 | Steve 
2 | Jacob 

表4：deputy_managers

id | manager_id | name 
1 | 2 | Mary 
2 | 2 | Linda 
3 | 1 | Nathan 

表3：team_leads

id | deputy_manager_id | name 
1 | 3 | Stephen 
2 | 1 | Patrick 
3 | 2 | Tony 
4 | 1 | Austin 

表2：sales_executives

id | team_lead_id | name 
1 | 1 | Johnny 
2 | 3 | Dalton 
3 | 4 | Sonora 
4 | 2 | Jessie 

表1：銷售

id | sales_executive_id | product | quantity 
1 | 3 | product1 | 10 
2 | 2 | product3 | 6 
3 | 3 | product2 | 5 
4 | 1 | product1 | 4 

隨着銷售表中提供的數據，我想寫MySQL查詢獲取銷售的產品的總量：

1. 從經理史蒂夫的團隊。
2. 從副經理瑪麗的團隊。
3. 從團隊領導Tony的團隊。

請幫忙。

在此先感謝。

Answer 1

1. 從經理史蒂夫的團隊

   SELECT product, SUM(quantity) 
   FROM  managers   m 
       JOIN deputy_managers d ON d.manager_id   = m.id 
       JOIN team_leads  t ON t.deputy_manager_id = d.id 
       JOIN sales_executives e ON e.team_lead_id  = t.id 
       JOIN sales   s ON s.sales_executive_id = e.id 
   WHERE m.name = 'Steve' 
   GROUP BY product 
   

2. 從副經理瑪麗的團隊

   SELECT product, SUM(quantity) 
   FROM  deputy_managers d 
       JOIN team_leads  t ON t.deputy_manager_id = d.id 
       JOIN sales_executives e ON e.team_lead_id  = t.id 
       JOIN sales   s ON s.sales_executive_id = e.id 
   WHERE d.name = 'Mary' 
   GROUP BY product 
   

3. 從團隊領導託尼的團隊

   SELECT product, SUM(quantity) 
   FROM  team_leads  t 
       JOIN sales_executives e ON e.team_lead_id  = t.id 
       JOIN sales   s ON s.sales_executive_id = e.id 
   WHERE t.name = 'Tony' 
   GROUP BY product 
   

請在sqlfiddle上查看。