mysql: remove rows with repeated values with condition (repeated columns) - mysql

Question

I have a table "player" as follow
where:
ID is primary key.
date = date they play (just for 1 month, so could from 1 to 31)
Name = name of the players
Sport = sport they play and there can be many sports in the list; but i only focus on the one who play "football" and play more than 2 games in one day
This is the table "player".
+----+------------+-------+-------------+
| ID | Date | Name | Sport |
+----+------------+-------+-------------+
| 1 | 1 | A | football |
| 2 | 1 | A | soccer |
| 3 | 3 | A | tennis |
| 4 | 2 | B | tennis |
| 5 | 2 | B | football |
| 6 | 1 | C | basketball |
| 7 | 1 | C | tennis |
| 8 | 1 | C | fishing |
| 9 | 4 | D | football |
+----+------------+-------+-------------+
I want to find list of the people (name and sport) who DO NOT:
practice "football" + other sport(s) in one day.
note: if someone who play "football" + other game(s) in one day, we remove him from the list for that day. only remove him for that particular day.
So the result should be like this,
+----+------+------+-----------+
| ID | Date | Name | Sport |
+----+------+------+-----------+
| 3 | 3 | A | tennis |
| 6 | 1 | C | basketball|
| 7 | 1 | C | tennis |
| 8 | 1 | C | fishing |
| 9 | 4 | D | football |
+----+------+------+-----------+
This is the follow up problem listed
mysql: find rows with repeated values plus condition
thank you for helping !

Answer 1

You should be looking for this:
Here, we are omitting the key record values (date + name) those match in an intersection of key record values (date + name) who played football and key record values (date + name) who did not play football
SELECT
p1.*
FROM
player p1
LEFT JOIN
(SELECT
pnfb.*
FROM
(SELECT
date, name
FROM
player
WHERE
sport <> 'football') pnfb
JOIN (SELECT
date, name
FROM
player
WHERE
sport = 'football') pfb ON (pnfb.date = pfb.date
AND pnfb.name = pfb.name)) p2 ON (p1.date = p2.date AND p1.name = p2.name)
WHERE
p2.date IS NULL;

Answer 2

If I've understood correctly, you want to obtain the dates and names of players who on that date either played only one sport or did not play football:
SELECT Date, Name
FROM player
GROUP BY Date, Name
HAVING COUNT(DISTINCT Sport) = 1
OR NOT SUM(Sport='football')
See it on sqlfiddle.
If you want to see which sports they did play and/or obtain the ID of the relevant records, you can join the above back to your player table:
SELECT * FROM player NATURAL JOIN (
SELECT Date, Name
FROM player
GROUP BY Date, Name
HAVING COUNT(DISTINCT Sport) = 1
OR NOT SUM(Sport='football')
) t
See it on sqlfiddle.