MySQL query for nested or join - mysql

Question

I have such a MYSQL table
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`screen_name` text NOT NULL,
`user_no` int(20) NOT NULL,
`avatar` text NOT NULL,
`name` varchar(50) NOT NULL,
`location` varchar(50) DEFAULT NULL
PRIMARY KEY (`id`)
I need to create an SQL query.
ORDER BY id DESC
GROUP BY screen_name
Get "name" and "screen_name" fields
id between $idmin and $idmax
I will compare the performance of nested query and JOIN query seperately.
Can you propose query words?
Thank you
Edit: For nested query I tried this:
SELECT `name`,`screen_name` FROM `mytable` WHERE `id` IN
(SELECT `id` FROM `mytable` WHERE `id` BETWEEN 100 AND 500 ORDER BY `id` DESC)
GROUP BY `screen_name`
I couldn't write for joined type.
Edit2: Say it I have such rows:
id=1, screen_name=mike, name=uk
id=2, screen_name=albert, name=usa
id=3, screen_name=ash, name=uk
id=4, screen_name=albert, name=new_zelland
I need to get results like this:
id=4
id=3
id=1

Answer 1

Your query should be in this format:
SELECT MAX(id) AS max_id, user_no, screen_name
FROM table_name
WHERE id BETWEEN $idmin AND $idmax
GROUP BY screen_name
ORDER BY MAX(id) DESC;
SQLFIDDLE DEMO HERE
or with sub-query:
SELECT a.id, a.name, a.screen_name
FROM example a
INNER JOIN (SELECT screen_name, MAX(id) id
FROM example
WHERE id BETWEEN 1 AND 4
GROUP BY screen_name
) b
ON a.screen_name = b.screen_name
AND a.id = b.id
ORDER BY a.id DESC;
SQLFIDDLE DEMO HERE