task: #1795

Author: Ivanbyone

README.md

@@ -144,6 +144,7 @@ Useful for preparing for technical interviews and improving your SQL skills.
     - [1731. The Number of Employees Which Report to Each Employee](./leetcode/easy/1731.%20The%20Number%20of%20Employees%20Which%20Report%20to%20Each%20Employee.sql)
     - [1741. Find Total Time Spent by Each Employee](./leetcode/easy/1741.%20Find%20Total%20Time%20Spent%20by%20Each%20Employee.sql)
     - [1789. Primary Department for Each Employee](./leetcode/easy/1789.%20Primary%20Department%20for%20Each%20Employee.sql)
+    - [1795. Rearrange Products Table](./leetcode/easy/1795.%20Rearrange%20Products%20Table.sql)
     - [1965. Employees With Missing Information](./leetcode/easy/1965.%20Employees%20With%20Missing%20Information.sql)
     - [1978. Employees Whose Manager Left the Company](./leetcode/easy/1978.%20Employees%20Whose%20Manager%20Left%20the%20Company.sql)
     - [2356. Number of Unique Subjects Taught by Each Teacher](./leetcode/easy/2356.%20Number%20of%20Unique%20Subjects%20Taught%20by%20Each%20Teacher.sql)

leetcode/easy/1795. Rearrange Products Table.sql

@@ -0,0 +1,48 @@
+/*
+Question 1795. Rearrange Products Table
+Link: https://leetcode.com/problems/rearrange-products-table/description/?envType=problem-list-v2&envId=database
+
+Table: Products
+
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| product_id  | int     |
+| store1      | int     |
+| store2      | int     |
+| store3      | int     |
++-------------+---------+
+product_id is the primary key (column with unique values) for this table.
+Each row in this table indicates the product's price in 3 different stores: store1, store2, and store3.
+If the product is not available in a store, the price will be null in that store's column.
+ 
+
+Write a solution to rearrange the Products table so that each row has (product_id, store, price). If a product is not available in a store, do not include a row with that product_id and store combination in the result table.
+
+Return the result table in any order.
+*/
+
+SELECT 
+    product_id,
+    'store1' AS store,
+    store1 AS price
+FROM Products
+WHERE store1 IS NOT NULL
+
+UNION ALL
+
+SELECT 
+    product_id,
+    'store2' AS store,
+    store2 AS price
+FROM Products
+WHERE store2 IS NOT NULL
+
+UNION ALL
+
+SELECT 
+    product_id,
+    'store3' AS store,
+    store3 AS price
+FROM Products
+WHERE store3 IS NOT NULL