how many data source can be import into a workbook at a time?

 In Tableau, you can import multiple data sources into a single workbook. There is no specific limit on the number of data sources you can import. However, the number of data sources you can import and effectively work with depends on factors such as the size and complexity of the data, the available system resources, and the performance of your computer.

Tableau allows you to blend or join data from different sources within a single workbook, enabling you to create comprehensive visualizations and perform in-depth analysis by combining data from various data sources.

You can add additional data sources to a workbook by following the same steps mentioned earlier for importing a data source. Each imported data source will appear as a separate connection within the workbook, and you can manage and interact with them independently or blend them together as needed.

Remember to consider the performance implications when working with multiple data sources, especially if they contain large volumes of data. In some cases, it might be more efficient to preprocess and consolidate data from multiple sources outside of Tableau before importing them into a single workbook.