If you use a percent difference Quick Table Calculation, what value will be the first data value?
Answer(s): A
When using a Percent difference, Tableau calculates what the percent change has occured as compared to the last data value. BUT, for the first data value, there is no previous value to compare it to. Hence, it appears as NULL.
Dimensions containing ____________ and ____________ values cannot be continuous.
Answer(s): A,D
According to Tableau's official documentation -
https://help.tableau.com/current/pro/desktop/en-us/datafields_typesandroles.htm
As a general best practice, how many categories can a pie chart display effectively?
As a general best practice, your pie chart should contain 2 to 5 categories. Anything more than that is not easy for the eyes to distinguish. This is a common question and mentioned in Tableau's own eLearning module as well!See how to build a pie chart:
https://help.tableau.com/current/pro/desktop/en-us/buildexamples_pie.htm
Which of the following is true about 'Incremental refresh' when creating Extracts in Tableau?
Extracts are saved subsets of data that you can use to improve performance or to take advantage of Tableau functionality not available or supported in your 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. After you create an extract, you can refresh it with data from the original data.When refreshing the data, you have the option to either do a full refresh, which replaces all of the contents in the extract, or you can do an incremental refresh, which only adds rows that are new since the previous refresh.
https://help.tableau.com/current/pro/desktop/en-us/extracting_data.htm
By default, what does Tableau do when you connect to a data source?
Answer(s): B
Before you can build a view and analyze your data, you must first connect Tableau to your data.Tableau supports connecting to a wide variety of data, stored in a variety of places.By default, when you connect a data source to Tableau, Tableau will create a live connection to the data.Live connection refers to a data source that contains direct connection to underlying data, which provides real-time or near real-time data. With a live connection, Tableau makes queries directly against the database or other source, and returns the results of the query for use in a workbook. Users can create live connections and then share them on Tableau Server so that other Tableau users can use the same data using the same connection and filtering settings.
https://help.tableau.com/current/guides/everybody-install/en-us/everybody_admin_data.htm
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