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SQL Server ROW_NUMBER Function Guide
databasestar.com/row_number-sql-server/Yapay zekadan makale özeti
- Basic Functionality
- ROW_NUMBER adds unique incrementing numbers to each result row
- Function requires OVER clause with ORDER BY for calculation
- Similar to Oracle's ROWNUM function
- Advanced Features
- Can operate over entire result set or specific data ranges
- PARTITION BY keyword allows grouping data for row number calculation
- Supports pagination by showing results in specific row number ranges
- Comparison with RANK and DENSE_RANK
- ROW_NUMBER shows unique numbers regardless of duplicates
- RANK skips duplicates and resumes ranking
- DENSE_RANK shows same values without skipping duplicates
- Implementation Example
- Used to show product prices from most to least expensive
- Demonstrates row number calculation within product categories
- Shows pagination using subquery with WHERE clause