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 with unique values) 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 with unique values) for this table.\ncustomerId is a foreign key (reference columns) 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 a solution to find all customers who never order anything.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">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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                    "code": "import pandas as pd\n\ndef find_customers(customers: pd.DataFrame, orders: pd.DataFrame) -> pd.DataFrame:\n    ",
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                    "lang": "PostgreSQL",
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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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                "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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