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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