![]() ![]() After you create an extract, you can refresh it with data from the original data. When you create an extract of your data, you can reduce the total amount of data by using filters and configuring other limits. Performance is optimised because it queries its own database engine instead of the local data source. Good for very large datasets of which we only need few fields. Tableau Data Extract (TDE) is a snapshot of the data that Tableau stores locally. For more information, see Create Parameters. Parameters – Values that can be used as placeholders in formulas, or replace constant values in calculated fields and filters. You can interact with these named sets in the same way you interact with other custom sets in Tableau. Named sets from an MS Analysis Services server or from a Teradata OLAP connector also appear in Tableau in this area of the Data pane. ![]() Sets are custom fields based on existing dimensions and criteria that you specify. Sets – Subsets of data that you define. These fields are called calculated fields.įor more information on calculated fields, see Create Custom Fields with Calculations. Examples of measures: sales, profit, number of employees, temperature, frequency.įor more information on what dimensions and measures are, see Dimensions and Measures, Blue and Green.Ĭalculated fields – If your underlying data doesn't include all of the fields you need to answer your questions, you can create new fields in Tableau using calculations and then save them as part of your data source. When you drag a measure into the view, Tableau applies an aggregation to that measure (by default). You can apply calculations to them and aggregate them. Measure fields – Fields that contain numeric, quantitative values can be measured. Examples of dimensions include dates, customer names, and customer segments. Dimensions affect the level of detail in the view. You can use dimensions to categorize, segment, and reveal the details in your data. Tableau displays data source connections and data fields for the workbook in the Data pane on the left side of the workspace.ĭimension fields – Fields that contain qualitative values (such as names, dates, or geographical data). ![]()
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