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Period-over-Period Comparisons
Last Updated: April 13, 2026
Ashish Pratap Singh
6 min read
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Sample Data
The Pattern
Approach 1: LAG on Aggregated Periods
Approach 2: Self-Join on Period
Approach 3: DATE_TRUNC + Correlated Subquery
Handling Missing Periods
When to Use Each Approach
Common Mistakes
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Consecutive Records ...
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Running Totals and C...
