MySQL 查询或仅返回数据子集？

Question

我在数据库表上运行了以下查询

SELECT *, CONVERT_TZ(`received_on`, '+00:00','+05:30') AS received_on 
FROM `user_chat_msgs` 
WHERE (`from_user`='54610' AND `to_user`='1') 
OR (`to_user`='1' AND `from_user`='54610') 
ORDER BY id DESC 
LIMIT 10000; 

这只返回类似

的消息

from_user= 54610 和 to_user=1

预期结果

from_user= 54610 和 to_user=1 或者from_user= 1 和 to_user=54610

逻辑上查询对我来说听起来是正确的，我不确定这里的问题是什么？

Answer 1

然后使用适当的 where 子句:

SELECT *, CONVERT_TZ(`received_on`, '+00:00','+05:30') AS received_on
FROM `user_chat_msgs`
WHERE (`from_user` = '54610' AND `to_user` = '1') OR
      (`from_user` = '1' AND `to_user` = '54610')
ORDER BY id DESC
LIMIT 10000; 

您的where 子句:

WHERE (`from_user` = '54610' AND `to_user` = '1') OR
      (`to_user` = '1' AND `from_user` = '54610') 

简单地重复这两个条件，但顺序不同。

注意:如果用户 ID 是数字，则不要在常量周围使用引号。