mysql在键值对中选择多行

Question

我有一个如下表所示的MySQL表：

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

现在我想执行搜索以查找： 所有UID都可以兼用吉他，等级为10 结果应显示为：

结果＆gt;

uid : u01 

但我有点卡住了，不知道应该是什么样的查询。 我知道我可能必须执行条件聚合，但可以请某人指导我

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