leetcode-problemset/算法题（国外版）/rearrange-products-table.json

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        "question": {
            "questionId": "1948",
            "questionFrontendId": "1795",
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            "title": "Rearrange Products Table",
            "titleSlug": "rearrange-products-table",
            "content": "<p>Table: <code>Products</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type    |\n+-------------+---------+\n| product_id  | int     |\n| store1      | int     |\n| store2      | int     |\n| store3      | int     |\n+-------------+---------+\nproduct_id is the primary key for this table.\nEach row in this table indicates the product&#39;s price in 3 different stores: store1, store2, and store3.\nIf the product is not available in a store, the price will be null in that store&#39;s column.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>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 <strong>not</strong> include a row with that <code>product_id</code> and <code>store</code> combination in the result table.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nProducts table:\n+------------+--------+--------+--------+\n| product_id | store1 | store2 | store3 |\n+------------+--------+--------+--------+\n| 0          | 95     | 100    | 105    |\n| 1          | 70     | null   | 80     |\n+------------+--------+--------+--------+\n<strong>Output:</strong> \n+------------+--------+-------+\n| product_id | store  | price |\n+------------+--------+-------+\n| 0          | store1 | 95    |\n| 0          | store2 | 100   |\n| 0          | store3 | 105   |\n| 1          | store1 | 70    |\n| 1          | store3 | 80    |\n+------------+--------+-------+\n<strong>Explanation:</strong> \nProduct 0 is available in all three stores with prices 95, 100, and 105 respectively.\nProduct 1 is available in store1 with price 70 and store3 with price 80. The product is not available in store2.\n</pre>\n",
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            "difficulty": "Easy",
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            "similarQuestions": "[{\"title\": \"Product's Price for Each Store\", \"titleSlug\": \"products-price-for-each-store\", \"difficulty\": \"Easy\", \"translatedTitle\": null}]",
            "exampleTestcases": "{\"headers\":{\"Products\":[\"product_id\",\"store1\",\"store2\",\"store3\"]},\"rows\":{\"Products\":[[0, 95, 100, 105], [1, 70, null, 80]]}}",
            "categoryTitle": "Database",
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                {
                    "lang": "MySQL",
                    "langSlug": "mysql",
                    "code": "# Write your MySQL query statement below\n",
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                {
                    "lang": "MS SQL Server",
                    "langSlug": "mssql",
                    "code": "/* Write your T-SQL query statement below */\n",
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                    "lang": "Oracle",
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                    "code": "/* Write your PL/SQL query statement below */\n",
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            "sampleTestCase": "{\"headers\":{\"Products\":[\"product_id\",\"store1\",\"store2\",\"store3\"]},\"rows\":{\"Products\":[[0, 95, 100, 105], [1, 70, null, 80]]}}",
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            "mysqlSchemas": [
                "Create table If Not Exists Products (product_id int, store1 int, store2 int, store3 int)",
                "Truncate table Products",
                "insert into Products (product_id, store1, store2, store3) values ('0', '95', '100', '105')",
                "insert into Products (product_id, store1, store2, store3) values ('1', '70', 'None', '80')"
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