What is the use of Column Prompts? Where they are used?

1.	What is the use of Column Prompts? Where they are used?
Answer» A column prompt is the most common and flexible prompt type. A column prompt enables you to build very specific value prompts to either stand alone on the dashboard or analysis or to expand or refine existing dashboard and analysis filters. Column prompts can be created for hierarchical, measure, or attribute columns at the analysis or dashboard level.

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