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Data Analytics

Pandas, SQL, Power BI, Tableau, data visualization

28 articles

SQL RANK vs DENSE_RANK vs ROW_NUMBER: When Rankings Skip or Repeat

SQL RANK vs DENSE_RANK vs ROW_NUMBER: When Rankings Skip or Repeat

Three SQL window functions, one confusing result set. If your rankings are skipping numbers or repeating unexpectedly, you're probably using the wrong function for the job. Here's exactly how each one works and when to reach for it.

Jun 09, 2026 2m read πŸ‘ 14
SQL DISTINCT vs GROUP BY: When Each One Silently Lies to You

SQL DISTINCT vs GROUP BY: When Each One Silently Lies to You

DISTINCT and GROUP BY look interchangeable until your row counts stop making sense. This guide exposes the subtle traps each one sets and shows you exactly when to use which β€” with real query examples you can run today.

Jun 02, 2026 7m read πŸ‘ 56
Power BI Cross-Filter Direction Bugs: Why Your Slicers Break Visuals

Power BI Cross-Filter Direction Bugs: Why Your Slicers Break Visuals

Your slicer filters one visual but leaves another completely untouched β€” and the data model looks fine. Cross-filter direction is usually the culprit, and fixing it is less obvious than it should be. Here's exactly what's going wrong and how to correct it.

May 30, 2026 7m read πŸ‘ 71
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