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Question allow you to save a single chart when you do not need to create a whole dashboard
A question is a page containing a single chart.
Questions share some features with dashboards, such as :
A question gives you access to three tabs
The visualisation lets you see the chart associated to your question.
The data tab allows you to see the computed data that was generated by your question in order to build the visualisation:
A question gives you a direct access to it's SQL query. By using this query in your data warehouse, you will be able to get the data table from the data tab.