Top 1 distinct rows from a table

Question

ID Username     ModifiedDate

1  A.BEENA     2009-12-07 04:48:17.980
2  A.BEENA     2009-11-17 06:02:27.443
3  Abhilash    2009-12-07 04:48:17.980
4  abhilash.r  2009-12-07 04:48:17.980
5  AJI         2009-11-17 06:02:27.443
6  haris       2009-12-07 04:48:17.980
7  haris       2009-11-17 06:02:27.443

I want to select details of all distinct users order by ModifiedDate.

I need output like this

   1 A.BEENA      2009-12-07 04:48:17.980
   3 Abhilash     2009-12-07 04:48:17.980
   4 abhilash.r   2009-12-07 04:48:17.980
   5 AJI          2009-11-17 06:02:27.443
   6 haris        2009-12-07 04:48:17.980

Please help me

Answer 1

Use the following query:

WITH CTE (DuplicateCount,Username,ModifiedDate) AS
(
    SELECT
        ROW_NUMBER() OVER (PARTITION BY Username ORDER BY ModifiedDate DESC) AS DuplicateCount,
        Username,
        ModifiedDate
    FROM YourTable
)
SELECT *
FROM CTE
WHERE DuplicateCount = 1

Answer 2

SELECT Username, MAX(ModifiedDate) AS LastModified
FROM MyTable
GROUP BY Username

This will give the output you mention, which appears to show the most recent date for each username.