Can you explain the concept of data blending in Tableau and when it is used?

 Data blending in Tableau is a technique used to combine data from multiple data sources or tables into a single view. It is primarily used when you have data residing in different data sources or tables that share a common field. By blending the data, you can analyze and visualize information from multiple sources simultaneously.

The process of data blending involves identifying a common field between the primary data source (the primary data table in your workbook) and the secondary data source (additional data table you want to blend). Tableau automatically matches the common field and integrates the data based on that relationship.

Data blending is useful in situations where a single data source may not provide all the necessary information for analysis. It allows you to bring in supplementary data sources and combine them for a comprehensive view of the data. However, it's important to note that data blending has some limitations, such as reduced performance with large datasets and limited support for certain operations like aggregations across blended data.

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