Refreshing the Data

If you make modifications to a data source such as adding new fields or rows, changing data values or field names, or deleting data, Tableau will reflect those changes the next time you connect to the data source. However, because Tableau queries a data source and does not import the data, you can immediately update Tableau to reflect the data source modifications without disconnecting.
If you are connected to a data source that has been modified, you can immediately update Tableau with the changes by selecting a data source on the Data menu and then selecting Refresh.
If you remove a field from a data source that is used in a Tableau worksheet, and then refresh the data source, a warning message displays indicating that the field will be removed from the view and the worksheet will not display correctly because of the missing field.

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