MySQL根據特定的列值獲取所有行（按列過濾）

Question

我在這里有此表A：

| colA | colB
| 1    | 2
| 2    | 2 
| 3    | 3
| 3    | 2

我想查詢colB為3和2的所有行。結果將是：

|colA  | colB
| 3    | 3
| 3    | 2

我嘗試查詢：

select * from A where colB = 2 AND colB= 3

但是我一直都沒有回應。 嘗試過OR但也無法正常工作。 我了解到，我嘗試過的是某種“行”過濾。

有沒有辦法處理“列”過濾？

Answer 1

嘗試這個：

select *
from A
where colA IN (select colA 
               from A 
               where colB IN (2, 3)
               group by colA
               having count(distinct colB) = 2)

或使用JOIN ：

select A.*
from A 
join (select colA 
      from A 
      where colB IN (2, 3)
      group by colA
      having count(distinct colB) = 2
) as t on A.colA = t.ColA

Answer 2

您可以使用EXISTS() ：

SELECT * FROM YourTable a
WHERE EXISTS(SELECT 1 from YourTable s
             WHERE a.colA = s.colA
              and s.colB in(2,3)
             GROUP BY s.colA having count(distinct s.colB) = 2)