Difference between row number, rank and dense rank

Описание: Difference Between Row_Number() Rank() And Dense_Rank() In SQL Server

ROW_NUMBER() Function without Partition By clause :
Row_number plays a very important role in SQL server. Row_Number function can help to perform more complex ordering of row in the report format that allow the over clause in SQL standard.

Rank() Function in SQL Server :
This function will assign a unique value to each distinct Row, but it leaves a group between the groups.

Dense_Rank() Function in SQL Server :
Dense_Rank() Function is similar to Rank with only difference, this will not leave gaps between groups.

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