Question

考虑我有下表：

+----+--------+--------+
| id | roomID | userID |
+----+--------+--------+
|  1 |      9 |     34 |
|  2 |      9 |     76 |
|  3 |     87 |     90 |
+----+--------+--------+

我想找到只有某些用户参与的roomID - 所以在这个例子中我想找到仅用户34和76正在使用的roomID。我怎么能这样做？

Answer 1

我想，你问的是不同的东西，不是吗？这是您可以找到roomID用户34和76的方式：

select
  roomID
from
  table
where
  userID in (34,76)

Answer 2

您可以使用以下查询：

select roomID from your_table_name where Userid in (34,76)

您可以使用的唯一数据：

select roomID from your_table_name where Userid in (34,76) group by roomID

Answer 3

您可以使用： IN

SELECT roomID FROM table_name WHERE userID IN (34, 76);

Answer 4

找到仅用户34和76正在使用
的roomID

SELECT 
    roomID
FROM 
    TABLE1
WHERE     
    roomID IN (SELECT roomID FROM TABLE1 WHERE userID = 76) 
    AND 
    roomID IN (SELECT roomID FROM TABLE1 WHERE userID = 34)
    AND
    roomID NOT IN (SELECT roomID FROM TABLE1 WHERE userID NOT IN (34, 76))

查找roomID中的所有用户

4 个答案: