In SQL, the LAST_VALUE function is used to return the last value in an ordered set of values. By default, it considers all duplicate values in the set and returns the last occurrence. However, there might be cases where you want to get the last distinct value from a set. In such situations, you can use the DISTINCT keyword along with LAST_VALUE.

Here’s an example to demonstrate how to use LAST_VALUE with the DISTINCT keyword:

SELECT DISTINCT LastName, 
       LAST_VALUE(FirstName) OVER (PARTITION BY LastName ORDER BY CreateDate) AS LastDistinctFirstName
FROM Employees;

In the above example, we have a table named Employees with columns LastName, FirstName, and CreateDate. We want to retrieve the last distinct FirstName for each LastName.

The DISTINCT keyword ensures that only distinct LastName values are considered. The LAST_VALUE function then returns the last FirstName within each distinct group of LastName values, based on the ordering specified in the ORDER BY clause (in this case, CreateDate).

By using LAST_VALUE with the DISTINCT keyword, you can obtain the desired results and get the last distinct value from a set of values in SQL.

#SQL #LAST_VALUE #DISTINCT