Question

表5：经理

id | name
1 | Steve
2 | Jacob

table4：deputy_managers

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

table3：team_leads

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

table2：sales_executives

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

table1：sales

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

使用sales表中的数据，我想编写mysql查询来获取所售产品的总数量：

来自经理Steve的团队。
来自副经理Mary的团队。
来自团队领导Tony的团队。

请帮忙。

提前致谢。

Answer 1

来自经理史蒂夫的团队

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

来自副经理玛丽的团队

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

来自团队领导Tony的团队

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

在sqlfiddle上查看。

MySQL：根据table2中标记为table1的值从table3中检索结果

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