Contrasting ROW_NUMBER(), RANK(), and DENSE_RANK()

Among the ranking window functions, ROW_NUMBER() is the most common, followed by RANK() and DENSE_RANK(). Each of these ranking functions (as well as NTILE()) provides us with a different way to rank records in SQL Server.

In this exercise, we would like to determine how frequently each we see incident type 3 in our data set. We would like to rank the number of incidents in descending order, such that the date with the highest number of incidents has a row number, rank, and dense rank of 1, and so on. To make it easier to follow, we will only include dates with at least 8 incidents.

Fill in each window function based on the column alias. You should include ROW_NUMBER(), RANK(), and DENSE_RANK() exactly once.
Fill in the OVER clause ordering by ir.NumberOfIncidents in descending order.

Exercise

Contrasting ROW_NUMBER(), RANK(), and DENSE_RANK()

Instructions