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LAG, LEAD, and Row Comparison
Last Updated: April 13, 2026
Ashish Pratap Singh
8 min read
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Sample Data
LAG: Accessing the Previous Row
LEAD: Accessing the Next Row
Offset and Default Parameters
Period-over-Period Comparisons
Change Detection
LAG and LEAD with PARTITION BY
LAG vs. Self-Join
Common Mistakes
Dialect Differences
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RANK, DENSE_RANK, an...
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FIRST_VALUE, LAST_VA...
