For instance, check for any null or outlier values. The dataset is now loaded for you to explore and verify that it’s well structured before visualization. Select and open the CSV file from where you saved it in your computer. Click on the “Text File” option to access the CSV data file. In our case, we downloaded a sales dataset sample for our analysis from Kaggle. In such a case, download the servers, for example, MySQL. However, some data source connections are not available by default. The main screen shows different options for connecting to a data source. When you open a new Tableau Public file known as a book, a pop-up window prompts you to connect to a data source, as shown in the screenshot below.
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