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"title" : "Product Price at a Given Date" ,
"titleSlug" : "product-price-at-a-given-date" ,
"content" : "<p>Table: <code>Products</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| product_id | int |\n| new_price | int |\n| change_date | date |\n+---------------+---------+\n(product_id, change_date) is the primary key (combination of columns with unique values) of this table.\nEach row of this table indicates that the price of some product was changed to a new price at some date.</pre>\n\n<p> </p>\n\n<p>Write a solution to find the prices of all products on <code>2019-08-16</code>. Assume the price of all products before any change is <code>10</code>.</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> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nProducts table:\n+------------+-----------+-------------+\n| product_id | new_price | change_date |\n+------------+-----------+-------------+\n| 1 | 20 | 2019-08-14 |\n| 2 | 50 | 2019-08-14 |\n| 1 | 30 | 2019-08-15 |\n| 1 | 35 | 2019-08-16 |\n| 2 | 65 | 2019-08-17 |\n| 3 | 20 | 2019-08-18 |\n+------------+-----------+-------------+\n<strong>Output:</strong> \n+------------+-------+\n| product_id | price |\n+------------+-------+\n| 2 | 50 |\n| 1 | 35 |\n| 3 | 10 |\n+------------+-------+\n</pre>\n" ,
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"exampleTestcases" : "{\"headers\":{\"Products\":[\"product_id\",\"new_price\",\"change_date\"]},\"rows\":{\"Products\":[[1,20,\"2019-08-14\"],[2,50,\"2019-08-14\"],[1,30,\"2019-08-15\"],[1,35,\"2019-08-16\"],[2,65,\"2019-08-17\"],[3,20,\"2019-08-18\"]]}}" ,
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{
"lang" : "Pandas" ,
"langSlug" : "pythondata" ,
"code" : "import pandas as pd\n\ndef price_at_given_date(products: pd.DataFrame) -> pd.DataFrame:\n " ,
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"sampleTestCase" : "{\"headers\":{\"Products\":[\"product_id\",\"new_price\",\"change_date\"]},\"rows\":{\"Products\":[[1,20,\"2019-08-14\"],[2,50,\"2019-08-14\"],[1,30,\"2019-08-15\"],[1,35,\"2019-08-16\"],[2,65,\"2019-08-17\"],[3,20,\"2019-08-18\"]]}}" ,
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"Create table If Not Exists Products (product_id int, new_price int, change_date date)" ,
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"insert into Products (product_id, new_price, change_date) values ('1', '20', '2019-08-14')" ,
"insert into Products (product_id, new_price, change_date) values ('2', '50', '2019-08-14')" ,
"insert into Products (product_id, new_price, change_date) values ('1', '30', '2019-08-15')" ,
"insert into Products (product_id, new_price, change_date) values ('1', '35', '2019-08-16')" ,
"insert into Products (product_id, new_price, change_date) values ('2', '65', '2019-08-17')" ,
"insert into Products (product_id, new_price, change_date) values ('3', '20', '2019-08-18')"
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