Top Tableau Scenario-Based Interview Questions Set -4 (1- 6)

1. How would you fix blend errors?
   Ensure both data sources have a common linking field with matching data types and values.
   Example:

   STR([Customer ID])
   

   Convert fields to same datatype if one source has Number and another has String.

2. How would you fix duplicate marks in blended view?
   Duplicates usually happen due to different granularity in secondary source.
   Use aggregation like:

   SUM([Target Sales])
   

   or FIXED LOD:

   { FIXED [Region] : SUM([Target]) }
   

3. How would you reduce marks in scatter plot?
   Reduce dimensions and aggregate measures to minimize rendered points.
   Example:

   AVG([Sales])
   

   by Region instead of Customer-level data reduces mark count significantly.

4. How would you design mobile-friendly dashboards?
   Use Device Designer and create separate mobile layouts with fewer visuals and filters.
   Example:
   Keep only KPI cards and one chart on mobile instead of full desktop dashboard.

5. How would you secure row-level data?
   Create user-based filter logic using USERNAME() function.
   Example:

   [Region Manager] = USERNAME()
   

   Users will see only their assigned region data.

6. How would you fix incorrect totals in dashboard?
   Validate joins, aggregation level, and table calculation scope.
   Example:

   SUM([Sales])
   

   may duplicate after joins, so use:

   { FIXED [Order ID] : SUM([Sales]) }
   

   to avoid inflated totals.

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