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what are the differences among rownum, rank and dense_rank? : Sql dba
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Answer Posted / Shalendra Singh
In SQL, Rownum, Rank, and Dense_Rank are functions used for ordering result sets. Here are the main differences:nn1. Rownum - Returns a unique row number for each record in a query result set. It starts counting from 1 regardless of any sorting.n2. Rank - Assigns a ranking value to each record based on an order specified in the query. If there are ties, Rank assigns the same rank value to the tied records.n3. Dense_Rank - Similar to Rank but treats ties as separate ranks by incrementing the ranking number for each tie. This results in no gaps in the ranking sequence.
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