Throughout my time at the Data School I have certainly grown to appreciate a data dictionary explaining what some more cryptic field names actually mean. Today I found that we have the functionality within Tableau to build in a data dictionary into a Tableau Data Source in three simple clicks:
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Right-Click the field you want to add a definition to:
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Hover the mouse over "Default Properties" and go to Comment.
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Add your description and hover over the field in the data pane to see the description show up.
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With this strategy we can document the fields that have names that are less clear and embed a data dictionary into our workbook - or the Tableau Data Source if we wish to push it to a server.