leetcode-problemset/leetcode/originData/customers-who-never-order.json

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            "title": "Customers Who Never Order",
            "titleSlug": "customers-who-never-order",
            "content": "<p>Table: <code>Customers</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type    |\n+-------------+---------+\n| id          | int     |\n| name        | varchar |\n+-------------+---------+\nid is the primary key column for this table.\nEach row of this table indicates the ID and name of a customer.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Table: <code>Orders</code></p>\n\n<pre>\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| id          | int  |\n| customerId  | int  |\n+-------------+------+\nid is the primary key column for this table.\ncustomerId is a foreign key of the ID from the Customers table.\nEach row of this table indicates the ID of an order and the ID of the customer who ordered it.\n</pre>\n\n<p>&nbsp;</p>\n\n<p>Write an SQL query to report all customers who never order anything.</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> \nCustomers table:\n+----+-------+\n| id | name  |\n+----+-------+\n| 1  | Joe   |\n| 2  | Henry |\n| 3  | Sam   |\n| 4  | Max   |\n+----+-------+\nOrders table:\n+----+------------+\n| id | customerId |\n+----+------------+\n| 1  | 3          |\n| 2  | 1          |\n+----+------------+\n<strong>Output:</strong> \n+-----------+\n| Customers |\n+-----------+\n| Henry     |\n| Max       |\n+-----------+\n</pre>\n",
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            "difficulty": "Easy",
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            "exampleTestcases": "{\"headers\": {\"Customers\": [\"id\", \"name\"], \"Orders\": [\"id\", \"customerId\"]}, \"rows\": {\"Customers\": [[1, \"Joe\"], [2, \"Henry\"], [3, \"Sam\"], [4, \"Max\"]], \"Orders\": [[1, 3], [2, 1]]}}",
            "categoryTitle": "Database",
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                    "name": "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",
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                    "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\": {\"Customers\": [\"id\", \"name\"], \"Orders\": [\"id\", \"customerId\"]}, \"rows\": {\"Customers\": [[1, \"Joe\"], [2, \"Henry\"], [3, \"Sam\"], [4, \"Max\"]], \"Orders\": [[1, 3], [2, 1]]}}",
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            "mysqlSchemas": [
                "Create table If Not Exists Customers (id int, name varchar(255))",
                "Create table If Not Exists Orders (id int, customerId int)",
                "Truncate table Customers",
                "insert into Customers (id, name) values ('1', 'Joe')",
                "insert into Customers (id, name) values ('2', 'Henry')",
                "insert into Customers (id, name) values ('3', 'Sam')",
                "insert into Customers (id, name) values ('4', 'Max')",
                "Truncate table Orders",
                "insert into Orders (id, customerId) values ('1', '3')",
                "insert into Orders (id, customerId) values ('2', '1')"
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