SQL Interview Questions - Row_Number() vs Rank() vs Dense_Rank()

In this tutorial, you will learn "How to use Row_Number() vs Rank() vs Dense_Rank() in SQL" in SQL Server.

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The ROW_NUMBER(), RANK(), and DENSE_RANK() functions are window functions in SQL that assign unique numbers to rows within a result set based on the order specified in the ORDER BY clause of the window function. While they serve similar purposes, there are key differences in how they handle ties (rows with equal values in the ordering).

1. ROW_NUMBER() The ROW_NUMBER() function assigns a unique sequential integer to rows within a partition of the result set. It does not handle ties; each row gets a unique number regardless of the values in the columns.

2. RANK() The RANK() function assigns a rank to each row within a partition of the result set. Rows with the same values receive the same rank, and the next rank after a tie will skip numbers accordingly (leaving gaps).

3. DENSE_RANK() The DENSE_RANK() function also assigns a rank to each row within a partition of the result set. However, unlike RANK(), it does not leave gaps in the ranking sequence after ties.

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