refactor 1083

fishercoder1534 · fishercoder1534 · commit c11cb444f808 · 2020-04-25T13:51:55.000-07:00
diff --git a/database/_1083.sql b/database/_1083.sql
@@ -1,63 +1,3 @@
---1083. Sales Analysis II
---
---Table: Product
---
---+--------------+---------+
---| Column Name  | Type    |
---+--------------+---------+
---| product_id   | int     |
---| product_name | varchar |
---| unit_price   | int     |
---+--------------+---------+
---product_id is the primary key of this table.
---Table: Sales
---
---+-------------+---------+
---| Column Name | Type    |
---+-------------+---------+
---| seller_id   | int     |
---| product_id  | int     |
---| buyer_id    | int     |
---| sale_date   | date    |
---| quantity    | int     |
---| price       | int     |
---+------ ------+---------+
---This table has no primary key, it can have repeated rows.
---product_id is a foreign key to Product table.
---
---
---Write an SQL query that reports the buyers who have bought S8 but not iPhone. Note that S8 and iPhone are products present in the Product table.
---
---The query result format is in the following example:
---
---Product table:
---+------------+--------------+------------+
---| product_id | product_name | unit_price |
---+------------+--------------+------------+
---| 1          | S8           | 1000       |
---| 2          | G4           | 800        |
---| 3          | iPhone       | 1400       |
---+------------+--------------+------------+
---
---Sales table:
---+-----------+------------+----------+------------+----------+-------+
---| seller_id | product_id | buyer_id | sale_date  | quantity | price |
---+-----------+------------+----------+------------+----------+-------+
---| 1         | 1          | 1        | 2019-01-21 | 2        | 2000  |
---| 1         | 2          | 2        | 2019-02-17 | 1        | 800   |
---| 2         | 1          | 3        | 2019-06-02 | 1        | 800   |
---| 3         | 3          | 3        | 2019-05-13 | 2        | 2800  |
---+-----------+------------+----------+------------+----------+-------+
---
---Result table:
---+-------------+
---| buyer_id    |
---+-------------+
---| 1           |
---+-------------+
---The buyer with id 1 bought an S8 but didn't buy an iPhone. The buyer with id 3 bought both.
-
---# Write your MySQL query statement below
 select distinct buyer_id from Sales s
 join Product p
 on p.product_id = s.product_id
