mysql: how to save ORDER BY after LEFT JOIN without reorder?

Question

I\'ve two table:

1) profiles

+----+---------+
| id | name    |
+----+---------+
|  1 | WILLIAM |
|  2 | JOHN    |
|  3 | ROBERT  |
|  4 | MI         


        

Answer 1

Try this:

SELECT
    a.name as `from_name`,
    b.name as `to_name`,
    c.from_id,
    c.to_id
FROM profiles a
LEFT JOIN request_for_friendship c
ON a.id = c.from_id
LEFT JOIN profiles b
ON c.to_id = b.id
GROUP BY a.name,b.name
ORDER BY a.name,b.name;

Or, if you want one row per "from" name:

SELECT
    a.name as `from_name`,
    IFNULL(GROUP_CONCAT(b.name),'-none-') as `to_name`,
    IFNULL(c.from_id,'-none-') as `from_id`,
    IFNULL(GROUP_CONCAT(c.to_id),'-none-') as `to_id`
FROM profiles a
LEFT JOIN request_for_friendship c
ON a.id = c.from_id
LEFT JOIN profiles b
ON c.to_id = b.id
GROUP BY a.name
ORDER BY a.name,b.name