SQL AND OR 查询

Posted 2023-02-19

【中文标题】SQL AND OR 查询

【英文标题】：SQL AND OR query

【发布时间】：2015-03-25 22:10:12

【问题描述】：

我正在尝试从我们的客户服务查询中选择一些消息，其中 Mmessage 所有者是 ABC，数据是 LIKE ABCDEF AND message ... 并且消息是从客户到 CSservice 或从 CSservice 到客户。

我该怎么做？

SELECT Date, From, To, Data 
FROM Ccustomers WITH (NoLock)
WHERE MSGowner = 'ABC' AND Data LIKE '%ABCDEF%' AND 
([From] ='Customer' AND [To] = 'CSservice') OR ([From] ='CSservice' AND [To] = 'Customer') 

ORDER by Date

【问题讨论】：

对于 jergen d 的答案加 1，您只需要在 OR 条件周围加上一组括号。

【参考方案1】：

SELECT Date, From, To, Data 
FROM Ccustomers WITH (NoLock)
WHERE MSGowner = 'ABC' 
AND Data LIKE '%ABCDEF%' 
AND 
(
   ([From] = 'Customer'  AND [To] = 'CSservice') OR 
   ([From] = 'CSservice' AND [To] = 'Customer')
)
ORDER by Date

【讨论】：

非常感谢。实际上我在发布消息几秒钟后就知道了这一点:) 还在学习 SQL :)

【参考方案2】：

您的查询基本正确。但是您必须考虑到and 连接比or 更“强”。要获得所需的输出，您需要设置括号。

试试这个：

SELECT Date, [From], [To], Data 
FROM Ccustomers WITH (NoLock)
WHERE MSGowner = 'ABC' 
AND Data LIKE '%ABCDEF%' 
AND (([From] = 'Customer'  AND [To] = 'CSservice') OR ([From] = 'CSservice' AND [To] = 'Customer'))
ORDER BY Date;