When you are using a relational data source you can convert any numeric or date field into a continuous field.
Some data requires special handling in Tableau. Specifically null values, unrecognized or ambiguous geographic locations, negative or zero values when working with a logarithmic scale, and negative or zero values when working with tree maps.
When your data contains these special values, Tableau cannot plot them in the view. Instead, a indicator displays in the lower right corner of the view. Click the indicator to see more options for how to handle these values.
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When you drag a measure or continuous date to the view, the values are shown along a continuous axis. If the field contains null values or there are zero or negative values on a logarithmic axis, Tableau cannot plot them. Instead, these values are shown using an indicator in the lower right corner of the view. Click the indicator and choose from the following options:
|Type of Data||Default Position|
|Negative Values on a Log Axis||1|
|Unknown Geographic Location||(0,0)|
When working with maps and geographic fields, any unknown or ambiguous locations display in the indicator in the lower right corner of the view. Click the indicator and choose from the following options:
When working with treemaps, any null or zero values display in the indicator in the lower right corner of the view. Click the indicator and choose from the following options:
If you don’t know how to handle the values, you can choose to leave the special values indicator. Generally, you should continue to show the indicator so that you know there is data that is not being shown in the view. However, you can optionally hide the indicator by right-clicking it and selecting Hide Indicator.
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