MySQL在鍵值對中選擇多行

Question

我有一個如下的MySQL表：

++++++++++++++++++++++++++++++
id | uid | key        | value
++++++++++++++++++++++++++++++
1  | u01 | instrument | guitar
2  | u01 | level_____ | 10
3  | u02 | instrument | guitar
4  | u02 | level_____ | 1

現在，我想執行一個查詢來搜索：所有可以同時彈吉他並且級別為10的UID，結果應顯示為：

結果>

uid : u01 

但是我有點卡住，不知道查詢應該是什么樣子。 我知道我可能必須執行條件聚合，但是可以請某人指導我

Answer 1

SELECT DISTINCT UID FROM TABLE WHERE VALUE IN ('PIANO', 'VIOLIN')

Answer 2

select uid
from your_table
where `key` = 'instrument'
and `value` in ('guitar','violin')
group by uid
having count(distinct `value`) = 2