根据值比较从多行中选择

Question

我有一张如下表：

ID     Languages Experience  
1      c++       5
1      Java      2
1      Python    7
2      C#        1
2      c++       4
3      PHP       8

等等。

我希望查询获取特定ID取决于多个非特定条件，例如：

选择包含语言php和Experience＆gt; 3以及语言c ++和Experience＆lt; 9

的ID

Answer 1

select id
from your_table
group by id
having sum(case when languages = 'php' and experience > 3 then 1 end) > 0
and sum(case when languages = 'c++' and experience < 9 then 1 end) > 0

Answer 2

这是您使用or寻找的内容：

select id
from yourtable
where (languages = 'PHP' and experience > 3)
   or (languages = 'c++' and experience < 9)