What is the purpose of the rownumber in sql?

In SQL, the ROW_NUMBER() function is used to assign a unique number to each row in the result set. It is typically used in conjunction with the ORDER BY clause to sequentially number the rows in the result set.

One of the main purposes of ROW_NUMBER() is to sort the rows in a result set and assign sequential numbers, making it easy to paginate the results or filter out a certain range of rows.

Another common use is to identify duplicate rows in query results. By using the ROW_NUMBER() function, you can assign the same sequence number to duplicate rows, making it easier to further process or filter them.

In general, the ROW_NUMBER() function assigns a unique sequential number to each row in the result set, making it easy to sort, paginate, and identify duplicate rows.