rearrange-products-table

Rearrange Products Table

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Table: <code>Products</code>

<pre>
+-------------+---------+
| Column Name | Type |
+-------------+---------+
| product_id | int |
| store1 | int |
| store2 | int |
| store3 | int |
+-------------+---------+
product_id is the primary key for this table.
Each row in this table indicates the product&#39;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&#39;s column.
</pre>

&nbsp;

Write an SQL query to rearrange the <code>Products</code> table so that each row has <code>(product_id, store, price)</code>. If a product is not available in a store, do not include a row with that <code>product_id</code> and <code>store</code> combination in the result table.

Return the result table in any order.

The query result format is in the following example.

&nbsp;
Example 1:

<pre>
Input: 
Products table:
+------------+--------+--------+--------+
| product_id | store1 | store2 | store3 |
+------------+--------+--------+--------+
| 0 | 95 | 100 | 105 |
| 1 | 70 | null | 80 |
+------------+--------+--------+--------+
Output: 
+------------+--------+-------+
| product_id | store | price |
+------------+--------+-------+
| 0 | store1 | 95 |
| 0 | store2 | 100 |
| 0 | store3 | 105 |
| 1 | store1 | 70 |
| 1 | store3 | 80 |
+------------+--------+-------+
Explanation: 
Product 0 is available in all three stores with prices 95, 100, and 105 respectively.
Product 1 is available in store1 with price 70 and store3 with price 80. The product is not available in store2.
</pre>

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