+-------------+---------+
| Column Name | Type |
+-------------+---------+
| date_id | date |
| make_name | varchar |
| lead_id | int |
| partner_id | int |
+-------------+---------+
该表没有主键。
该表包含日期、产品的名称,以及售给的领导和合伙人的编号。
名称只包含小写英文字母。
DailySales 表:
+-----------+-----------+---------+------------+
| date_id | make_name | lead_id | partner_id |
+-----------+-----------+---------+------------+
| 2020-12-8 | toyota | 0 | 1 |
| 2020-12-8 | toyota | 1 | 0 |
| 2020-12-8 | toyota | 1 | 2 |
| 2020-12-7 | toyota | 0 | 2 |
| 2020-12-7 | toyota | 0 | 1 |
| 2020-12-8 | honda | 1 | 2 |
| 2020-12-8 | honda | 2 | 1 |
| 2020-12-7 | honda | 0 | 1 |
| 2020-12-7 | honda | 1 | 2 |
| 2020-12-7 | honda | 2 | 1 |
+-----------+-----------+---------+------------+
结果表:
+-----------+-----------+--------------+-----------------+
| date_id | make_name | unique_leads | unique_partners |
+-----------+-----------+--------------+-----------------+
| 2020-12-8 | toyota | 2 | 3 |
| 2020-12-7 | toyota | 1 | 2 |
| 2020-12-8 | honda | 2 | 2 |
| 2020-12-7 | honda | 3 | 2 |
+-----------+-----------+--------------+-----------------+
在 2020-12-8,丰田(toyota)有领导者 = [0, 1] 和合伙人 = [0, 1, 2] ,同时本田(honda)有领导者 = [1, 2] 和合伙人 = [1, 2]。
在 2020-12-7,丰田(toyota)有领导者 = [0] 和合伙人 = [1, 2] ,同时本田(honda)有领导者 = [0, 1, 2] 和合伙人 = [1, 2]。
select date_id, make_name,
count(distinct lead_id) unique_leads,
count(distinct partner_id) unique_partners
from DailySales
group by 1,2