如何从列中具有两个不同值的表中进行选择？

Question

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这是示例db

我只想获得技能栏中同时拥有2和14的用户。答案应该是＆＃34; 2＆＃34;

Answer 1

试试这个：

SELECT seekerID
FROM mytable
WHERE skillID IN (2, 14)
GROUP BY seekerID
HAVING COUNT(DISTINCT skillID) = 2

只有在DISTINCT个skillID值出现多次的情况下才需要

seekerID个关键字。

Answer 2

最简单的方法是

select seekerID, count(*) as cnt
from table_name
where skillid in (2,14)
group by seekerID
having cnt = 2

Answer 3

使用它：

select seekerID from table_name where skillid="2" and seekerID = ( select author from table_name where skillid="14")