Combines data from multiple sources during analysis.
Used when: ✔ Different databases, ✔ Separate systems
109. What are LOD Expressions?
Answer:
LOD (Level of Detail) Expressions allow calculations at different granularities.
Types:
✔ FIXED
✔ INCLUDE
✔ EXCLUDE
Example:
{FIXED [Region] : SUM([Sales])}One of Tableau's most important interview topics.
110. Explain Table Calculations
Answer:
Table Calculations perform computations on displayed data.
Examples:
✔ Running Total
✔ Moving Average
✔ Percentage Difference
111. What are Actions in Tableau?
Answer:
Actions create interactivity.
Types:
✔ Filter Actions
✔ Highlight Actions
✔ URL Actions
Example: Clicking a region filters other charts.
112. How Do You Optimize Dashboards?
Answer:
Best Practices:
✔ Use extracts
✔ Reduce worksheets
✔ Limit filters
✔ Optimize calculations
✔ Remove unused fields
113. Explain Context Filters
Answer:
Context Filters create a temporary subset of data.
Process: Context Filter → Other Filters
Benefits:
✔ Faster filtering
✔ Better performance
114. What is a Dual-Axis Chart?
Answer:
A Dual-Axis Chart displays two measures on the same chart.
Example: Sales and Profit on one visualization.
Used for:
✔ Comparisons
✔ Trend analysis
115. Explain Data Source Filters
Answer:
Data Source Filters restrict data at the source level.
Benefits:
✔ Better performance
✔ Improved security
✔ Reduced data volume
🔥 Most Important Tableau Topics for Data Analyst Interviews
Recruiters frequently ask about:
✅ Dimensions vs Measures
✅ Calculated Fields
✅ Parameters
✅ Filters
✅ Sets and Groups
✅ LOD Expressions
✅ Table Calculations
✅ Dashboards
✅ Tableau Prep
✅ Dashboard Optimization
💡 Common Tableau Scenario Questions
Q: How would you build a sales dashboard in Tableau?
Answer:
Include:
✔ KPI Cards,
✔ Sales Trend Chart,
✔ Region Analysis,
✔ Product Analysis,
✔ Filters and Parameters
Q: How would you improve a slow Tableau dashboard?
Answer:
✔ Use Extracts
✔ Reduce Marks
✔ Optimize Calculations
✔ Use Context Filters
✔ Remove Unused Data
Q: Why are LOD Expressions important?
Answer:
They allow calculations independent of visualization level.
Example: Calculate regional sales while viewing city-level data.
🚀 Interview Tip
For Tableau interviews, don't just explain concepts. Be prepared to discuss:
✔ Dashboards you've built
✔ KPIs you've tracked
✔ Business problems solved
✔ Visualizations chosen and why
✔ Performance optimization techniques
Tableau Resources: https://whatsapp.com/channel/0029VasYW1V5kg6z4EHOHG1t
Double Tap ❤️ For Part-5