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DENSE_RANK() in SQL Server | SQL Query Tutorial #sqlserver #transactsql

DENSE_RANK() in SQL Server is a powerful window function that assigns a unique rank to each distinct row within a result set based on the specified order. It is similar to the RANK() function, but it does not leave gaps in the ranking when there are duplicate values. Instead, it provides a dense sequence of rank values, incrementing by 1 for each distinct row.

The basic syntax of the DENSE_RANK() function is as follows:

DENSE_RANK() OVER (PARTITION BY partition_expression ORDER BY order_expression [ASC|DESC])

DENSE_RANK(): The window function that generates a dense rank for each row.

PARTITION BY: Optional. It divides the result set into partitions based on the values of the specified column(s). The DENSE_RANK() function restarts the ranking for each partition separately.

ORDER BY: Specifies the column(s) by which the rows within each partition are ordered. The dense ranking is determined by this order.

[ASC|DESC]: Optional. Specifies the sort order for the ORDER BY clause. ASC (ascending) is the default.


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