SQL Server : how to avoid duplicate data?

Question

I want to query above picture.

Left picture is original data, right picture is query data.

select distinct ID, Nickname, Revision 
from test_table

This query do not show above picture.

How to avoid duplicate data?

Answer 1

If SQL Server, using window function ROW_NUMBER in subquery:

select t.id, t.nickname, t.revision
from (
    select t.*, row_number() over (
            partition by t.id order by t.revision desc
            ) rn
    from your_table t
    ) t
where rn = 1;

Or using TOP with ties with ROW_NUMBER:

select top 1 with ties *
from your_table
order by row_number() over (
        partition by id order by revision desc
        )

If MySQL:

select t.*
from your_table t
inner join (
    select id, MAX(revision) revision
    from your_table
    group by id
    ) t1 on t.id = t1.id
    and t.revision = t1.revision;

Answer 2

Another trick using TOP 1 with TIES

SELECT Top 1 with ties *
    FROM your_table t
Order by row_number() over (partition BY t.id order by t.revision DESC)