Selecting rows except some others - mysql

Question

ID | fruit | who | days_ago |
----------------------------------
1 | orange | Adam | 2 |
2 | banana | Adam | 3 |
3 | apple | Adam | 4 |
4 | kiwi | Adam | 2 |
6 | banana | Jimmy | 3 |
7 | apple | Jimmy | 5 |
8 | grapes | Jimmy | 1 |
9 | orange | Carol | 2 |
10 | grapes | Carol | 6 |
11 | lemon | Carol | 3 |
And my problem is:
The table contained information about who bought what fruit and when (when is an extra information I just need to keep).
I need to select all the fruits that Adam didn't buy.
ID | fruit | who | days_ago |
----------------------------------
8 | grapes | Jimmy | 1 |
10 | grapes | Carol | 6 |
11 | lemon | Carol | 3 |
And if Jimmy bought them, I don't want to know if Carol bought them too.
And my result should be this:
ID | fruit | who | days_ago |
----------------------------------
8 | grapes | Jimmy | 1 |
11 | lemon | Carol | 3 |
When I GROUP BY fruit, I lose information about who and days_ago (I don't understand how they're chosen).
And when I select unique fruits and drop all that Adam bought, I lose grapes which both Jimmy and Carol bought.
This isn't the actual table I'm working on. Just a simplification of what I'm struggling with.
Any ideas?

Answer 1

If you want the fruits that Adam didn't buy, you can use a subquery for this. Have the subquery select the fruits he did buy, and then have the main query say "not those".
SELECT *
FROM fruits
WHERE fruit NOT IN(
SELECT fruit
FROM fruits
WHERE who = "Adam"
)
DEMO: http://sqlfiddle.com/#!9/3974d/1
When you use GROUP BY, you are combining multiple rows into one. The other rows' data isn't gone, just hidden. Try using GROUP_CONCAT to see the list of who fields.
SELECT ID, fruit,
GROUP_CONCAT(who) as who,
GROUP_CONCAT(days_ago) AS days_ago
FROM fruits
WHERE fruit NOT IN(
SELECT fruit
FROM fruits
WHERE who = "Adam"
)
GROUP BY fruit
DEMO: http://sqlfiddle.com/#!9/3974d/3