real rank in mysql and php - php

Question

I do a simple SQL-Query:
SELECT `name`, `likes`
FROM `social`
WHERE `month` = '2015-01'
ORDER BY `likes` DESC
then I add a "Rank" wich is an intenger with ++
$data = array();
$rank = 0;
while ($table_row = mysqli_fetch_assoc($table)) {
$rank++;
$data[$table_row['name']] = $table_row;
$data[$table_row['name']]['rank'] = $rank;
}
The result is left and what I want on the right side
+------+------+-------+ +------+------+-------+
| rank | name | likes | | rank | name | likes |
+------+------+-------+ +------+------+-------+
| 1 | foo | 123 | | 1 | foo | 123 |
| 2 | mfoo | 33 | | 2 | mfoo | 33 |
| 3 | xfoo | 33 | | 2 | xfoo | 33 |
| 4 | yfoo | 30 | | 4 | yfoo | 30 |
| 5 | zfoo | 29 | | 5 | zfoo | 29 |
+------+------+-------+ +------+------+-------+
how do I get the right side table? is there a way to solve it in the query?
EDIT:
There I am standing now:
select IF(#likes=s.likes, #rownum, #rownum:=#rownum+1) rank2,
s.domain_name, s.likes,
(#likes:=s.likes) dummy
from social s,
(SELECT #rownum:=0) x,
(SELECT #likes:=0) y
WHERE `month` = '2015-01'
order by likes desc
but the rank is not 100% correct because I want to skip a rank instead of counting through

Answer 1

I see what's happening here.
I dont know about best practices but I'd probably do something like this myself:
$data = array();
$rank = 0;
$lastlike = 1;
$currentlike = 0;
$i = 0;
while ($table_row = mysqli_fetch_assoc($table)) {
$name = $table_row['name'];
$currentlike = $table_row['likes'];
if ($currentlike != $lastlike) $rank++;
$data[$i] = array('rank'=>$rank,'name'=>$name,'likes'=>$currentlike);
$lastlike = $currentlike;
$i++;
}
I've not checked it but you're welcome to try it out and see.

Answer 2

You can do this with SQL or with PHP (you can test to know which one is the faster).
Note : this 2 solutions will give you a rank which start at 0.
SQL :
SELECT
`name`,
`likes`,
(SELECT COUNT(*) FROM `social` AS S2 WHERE S1.likes > S2.likes) AS `rank_2`
FROM `social` AS S1
WHERE `month` = '2015-01'
ORDER BY `likes` DESC
PHP :
$data = array();
$rank = 0;
$likes_pre = -1;
while ($table_row = mysqli_fetch_assoc($table)) {
$likes_cur = $table_row['likes'];
if ($likes_pre > $likes_cur) {
$rank++;
}
$data[$table_row['name']] = $table_row;
$data[$table_row['name']]['rank'] = $rank;
$likes_pre = $likes_cur;
}
Not tested, but it should work.

Answer 3

Try this... rank should be the same for all rows with the same number of likes
$data = array();
$rank = 0;
$last_likes =0;
while ($table_row = mysqli_fetch_assoc($table)) {
if ($last_likes != $row['likes']) {
$rank++;
}
$data[$table_row['name']] = $table_row;
$data[$table_row['name']]['rank'] = $rank;
}