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SQL Essentials: RANK vs. DENSE_RANK
Both the RANK and DENSE_RANK functions are utilized to assign ranks to rows within a result set based on specified ordering criteria. While they serve similar purposes, they handle ties differently, leading to variations in the ranking sequence. Let's explore the distinctions between these two functions:
RANK Function:
- Definition: The RANK function assigns a rank to each row within a partition of a result set, with the same rank given to rows with identical values. However, it introduces gaps in the ranking sequence when ties occur.
- Syntax: RANK() OVER (PARTITION BY partition_expression ORDER BY order_expression)
- Result: Rows with equal values receive the same rank, and the subsequent rank is incremented by the number of tied rows, causing gaps in the ranking sequence.
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