Preface
Tableau is powered by a proprietary language, called VizQL. VizQL combines querying, analysis, and visualization into a single framework. Other BI tools offer querying (SQL, MDX), arranging the data through analysis, and then charting the data in three distinct steps. VizQL is what makes Tableau so quick and easy for analysts.
For VizQL to work properly, the underlying data needs to be in a very neat, tabular format with the following characteristics:
- Every column needs to contain values representing a distinct field, ideally free from null values
- The data needs to be at the lowest level of aggregation that the analyst needs to answer questions with no missing rows
From Tableau’s release in 2005 to the release of Tableau Prep Builder ...
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