I have two tables:
mysql> desc rank ;
+----------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| score_id | int(11) | NO | MUL | NULL | |
| user_id | int(11) | NO | MUL | NULL | |
| rank | int(11) | NO | MUL | NULL | |
| last_rank | int(11) | NO | MUL | NULL | |
+----------------+-------------+------+-----+---------+----------------+
mysql> desc score ;
+----------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| points | int(11) | NO | MUL | NULL | |
+----------------+-------------+------+-----+---------+----------------+
What I need to do is once a day, update the 'rank' of all records. Once a week, update the 'last_rank' of all records.
I can do a select that return a rank for each row:
SET @r = 0 ;
SELECT a.user_id, a.rank, @r:= (@r+1), a.last_rank,
b.points
FROM rank AS a
JOIN score AS b
WHERE a.score_id = b.id
ORDER BY b.points ;
However, I cant find a way to UPDATE the Rank table with this result...
- How can I do this?
- Is there a best (fast) way to do this?
MySQL Version:
mysql> SELECT VERSION();
+------------+
| VERSION() |
+------------+
| 5.1.61-log |
+------------+