add 1327

Author: fishercoder1534

README.md

@@ -845,6 +845,7 @@ _If you like this project, please leave me a star._ ★
 
 |  #  |      Title     |   Solutions   | Video         | Difficulty    | Tag          
 |-----|----------------|---------------|---------------|---------------|-------------
+|1327|[List the Products Ordered in a Period](https://leetcode.com/problems/list-the-products-ordered-in-a-period/)|[Solution](../master/database/_1327.sql) || Easy |
 |1280|[Students and Examinations](https://leetcode.com/problems/students-and-examinations/)|[Solution](../master/database/_1280.sql) | [:tv:](https://www.youtube.com/watch?v=ThbkV4Fs7iE)| Easy |
 |1251|[Average Selling Price](https://leetcode.com/problems/average-selling-price//)|[Solution](../master/database/_1251.sql) | | Easy |
 |1179|[Reformat Department Table](https://leetcode.com/problems/reformat-department-table/)|[Solution](../master/database/_1179.sql) |  | Easy |

database/_1327.sql

@@ -0,0 +1,88 @@
+--1327. List the Products Ordered in a Period
+--
+--Table: Products
+--
+--+------------------+---------+
+--| Column Name      | Type    |
+--+------------------+---------+
+--| product_id       | int     |
+--| product_name     | varchar |
+--| product_category | varchar |
+--+------------------+---------+
+--product_id is the primary key for this table.
+--This table contains data about the company's products.
+--Table: Orders
+--
+--+---------------+---------+
+--| Column Name   | Type    |
+--+---------------+---------+
+--| product_id    | int     |
+--| order_date    | date    |
+--| unit          | int     |
+--+---------------+---------+
+--There is no primary key for this table. It may have duplicate rows.
+--product_id is a foreign key to Products table.
+--unit is the number of products ordered in order_date.
+--
+--
+--Write an SQL query to get the names of products with greater than or equal to 100 units ordered in February 2020 and their amount.
+--
+--Return result table in any order.
+--
+--The query result format is in the following example:
+--
+--
+--
+--Products table:
+--+-------------+-----------------------+------------------+
+--| product_id  | product_name          | product_category |
+--+-------------+-----------------------+------------------+
+--| 1           | Leetcode Solutions    | Book             |
+--| 2           | Jewels of Stringology | Book             |
+--| 3           | HP                    | Laptop           |
+--| 4           | Lenovo                | Laptop           |
+--| 5           | Leetcode Kit          | T-shirt          |
+--+-------------+-----------------------+------------------+
+--
+--Orders table:
+--+--------------+--------------+----------+
+--| product_id   | order_date   | unit     |
+--+--------------+--------------+----------+
+--| 1            | 2020-02-05   | 60       |
+--| 1            | 2020-02-10   | 70       |
+--| 2            | 2020-01-18   | 30       |
+--| 2            | 2020-02-11   | 80       |
+--| 3            | 2020-02-17   | 2        |
+--| 3            | 2020-02-24   | 3        |
+--| 4            | 2020-03-01   | 20       |
+--| 4            | 2020-03-04   | 30       |
+--| 4            | 2020-03-04   | 60       |
+--| 5            | 2020-02-25   | 50       |
+--| 5            | 2020-02-27   | 50       |
+--| 5            | 2020-03-01   | 50       |
+--+--------------+--------------+----------+
+--
+--Result table:
+--+--------------------+---------+
+--| product_name       | unit    |
+--+--------------------+---------+
+--| Leetcode Solutions | 130     |
+--| Leetcode Kit       | 100     |
+--+--------------------+---------+
+--
+--Products with product_id = 1 is ordered in February a total of (60 + 70) = 130.
+--Products with product_id = 2 is ordered in February a total of 80.
+--Products with product_id = 3 is ordered in February a total of (2 + 3) = 5.
+--Products with product_id = 4 was not ordered in February 2020.
+--Products with product_id = 5 is ordered in February a total of (50 + 50) = 100.
+
+--# Write your MySQL query statement below
+--credit: https://leetcode.com/problems/list-the-products-ordered-in-a-period/discuss/491314/MYSQL
+
+select a.product_name, sum(unit) as unit
+from Products a
+left join Orders b
+on a.product_id = b.product_id
+where b.order_date between '2020-02-01' and '2020-02-29'
+group by a.product_id
+having sum(unit) >= 100