如何從一列中有兩個不同值的表中選擇？

Question

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這是示例數據庫

我只想讓在技能列中同時擁有2和14的用戶。 答案應該是“ 2”

Answer 1

嘗試這個：

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

僅當skillID值可以針對單個seekerID多次出現時，才需要DISTINCT關鍵字。

Answer 2

最簡單的方法是

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

Answer 3

用這個：

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