[no content]change-null-values-in-a-table-to-the-previous-value.json

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            "title": "Change Null Values in a Table to the Previous Value",
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            "difficulty": "Medium",
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            "exampleTestcases": "{\"headers\": {\"CoffeeShop\": [\"id\", \"drink\"]}, \"rows\": {\"CoffeeShop\": [[9, \"Rum and Coke\"], [6, null], [7, null], [3, \"St Germain Spritz\"], [1, \"Orange Margarita\"], [2, null]]}}",
            "categoryTitle": "Database",
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                    "name": "Database",
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            "sampleTestCase": "{\"headers\": {\"CoffeeShop\": [\"id\", \"drink\"]}, \"rows\": {\"CoffeeShop\": [[9, \"Rum and Coke\"], [6, null], [7, null], [3, \"St Germain Spritz\"], [1, \"Orange Margarita\"], [2, null]]}}",
            "metaData": "{\"mysql\": [\"Create table If Not Exists CoffeeShop (id int, drink varchar(20))\"], \"mssql\": [\"Create table CoffeeShop (id int, drink varchar(20))\"], \"oraclesql\": [\"Create table CoffeeShop (id int, drink varchar(20))\"], \"database\": true, \"name\": \"change_null_values\", \"pythondata\": [\"CoffeeShop = pd.DataFrame([], columns=['id', 'drink']).astype({'id':'Int64', 'drink':'object'})\"], \"postgresql\": [\"Create table If Not Exists CoffeeShop (id int, drink varchar(20))\"], \"database_schema\": {\"CoffeeShop\": {\"id\": \"INT\", \"drink\": \"VARCHAR(20)\"}}}",
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            "mysqlSchemas": [
                "Create table If Not Exists CoffeeShop (id int, drink varchar(20))",
                "Truncate table CoffeeShop",
                "insert into CoffeeShop (id, drink) values ('9', 'Rum and Coke')",
                "insert into CoffeeShop (id, drink) values ('6', 'None')",
                "insert into CoffeeShop (id, drink) values ('7', 'None')",
                "insert into CoffeeShop (id, drink) values ('3', 'St Germain Spritz')",
                "insert into CoffeeShop (id, drink) values ('1', 'Orange Margarita')",
                "insert into CoffeeShop (id, drink) values ('2', 'None')"
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