All About Data – Joins, Blends, and Data Structures

Connecting Tableau to data often means more than connecting to a single table in a single data source. You may need to use Tableau to join multiple tables from a single data source. For this purpose, we can use joins, which combine a dataset row with another dataset's row if a given key value matches. You can also join tables from disparate data sources or union data with a similar metadata structure.

Sometimes, you may need to merge data that does not share a common row-level key, meaning if you were to match two datasets on a row level like in a join, you would duplicate data because the row data in one dataset is of much greater detail (for example, cities) than the other dataset (which ...

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