Getting multiple maxes of summed values - mysql

Question

Consider this sample data:
+----------+------+--------+-----------------+
| username | qnum | qvalue | date |
+----------+------+--------+-----------------+
| Linda | 1 | 2 | 11/14/2017 7:25 |
+----------+------+--------+-----------------+
| Fred | 1 | 1 | 11/23/2017 7:59 |
+----------+------+--------+-----------------+
| Brian | 5 | 2 | 11/17/2017 7:25 |
+----------+------+--------+-----------------+
| Sandra | 6 | 1 | 11/25/2017 7:26 |
+----------+------+--------+-----------------+
| Tom | 6 | 1 | 11/22/2017 7:32 |
+----------+------+--------+-----------------+
| Paul | 6 | 1 | 11/22/2017 7:36 |
+----------+------+--------+-----------------+
| Andrew | 7 | 2 | 11/23/2017 7:37 |
+----------+------+--------+-----------------+
| Luke | 3 | 1 | 11/23/2017 8:03 |
+----------+------+--------+-----------------+
| William | 8 | 1 | 11/23/2017 8:03 |
+----------+------+--------+-----------------+
| Linda | 9 | 2 | 11/15/2017 8:03 |
+----------+------+--------+-----------------+
| Brian | 3 | 2 | 11/17/2017 8:04 |
+----------+------+--------+-----------------+
| Joan | 9 | 1 | 11/23/2017 8:04 |
+----------+------+--------+-----------------+
| Chris | 8 | 1 | 11/23/2017 8:04 |
+----------+------+--------+-----------------+
| Kim | 8 | 1 | 11/15/2017 8:04 |
+----------+------+--------+-----------------+
I am attempting to get the person who has the highest sum of qvalue for last week. I am able to get this information with the following SQL but my problem is that if more than one user has the top score then it does not show both of their names because I am using the LIMIT function. Is there a way to use max and sum together to get the desired result? The desired result would be a result set with both Linda and Brian listed because last week they both had a sum score of 4 and were tied.
SELECT username, SUM(qvalue) AS score FROM trivia_scoreboard
WHERE `date` >= CURDATE() - INTERVAL DAYOFWEEK(CURDATE())+6 DAY AND `date` < CURDATE() - INTERVAL DAYOFWEEK(CURDATE())-1 DAY
GROUP BY username
ORDER BY score DESC
LIMIT 1

Answer 1

You have to join that query with a query that gets everyone's total.
SELECT t1.*
FROM (
SELECT username, SUM(qvalue) AS score FROM trivia_scoreboard
WHERE `date` >= CURDATE() - INTERVAL DAYOFWEEK(CURDATE())+6 DAY AND `date` < CURDATE() - INTERVAL DAYOFWEEK(CURDATE())-1 DAY
GROUP BY username
) AS t1
JOIN (
SELECT SUM(qvalue) AS score FROM trivia_scoreboard
WHERE `date` >= CURDATE() - INTERVAL DAYOFWEEK(CURDATE())+6 DAY AND `date` < CURDATE() - INTERVAL DAYOFWEEK(CURDATE())-1 DAY
GROUP BY username
ORDER BY score DESC
LIMIT 1
) AS t2 ON t1.score = t2.score
DEMO

Answer 2

You can also phrase this using having:
SELECT ts.username, SUM(ts.qvalue) AS score
FROM trivia_scoreboard fs
WHERE ts.`date` >= CURDATE() - INTERVAL DAYOFWEEK(CURDATE())+6 DAY AND
ts.`date` < CURDATE() - INTERVAL DAYOFWEEK(CURDATE())-1 DAY
GROUP BY username
HAVING score = (SELECT SUM(ts2.qvalue) as score
FROM trivia_scoreboard ts2
WHERE ts2.`date` >= CURDATE() - INTERVAL DAYOFWEEK(CURDATE())+6 DAY AND
ts2.`date` < CURDATE() - INTERVAL DAYOFWEEK(CURDATE())-1 DAY
GROUP BY username
ORDER BY score DESC
LIMIT 1
);
The difference between this and the version using join is really a matter of taste. This might have slightly better performance, because of details about how aggregations scale on larger amounts of data.