不等于sql条件

Question

比方说，我有一个名为students的表。

栏目有：

student_id 
first_name 
last_name 
address 

在输出中，我要排除具有“地址”或“地址，在这里”的地址学生。

我试图

SELECT * FROM students WHERE address <> 'address' OR address <> 'address, here'; 

这是行不通的。

它只与

SELECT * FROM students WHERE address <> 'address'; 

工作如何做到这一点？

Answer 1

SELECT * 
FROM students 
WHERE 
    address <> 'address' 
    AND 
    address <> 'address, here' 

Answer 2

试试这个：

SELECT * FROM students WHERE (address <> 'address' AND address <> 'address, here'); 

Answer 3

使用，取而代之的或

SELECT * FROM students WHERE address <> 'address' AND address <> 'address, here'; 

address <> 'address' OR address <> 'address, here'将永远是正确的，因为一个地址不能'address'和'address, here'在同一时间。

Answer 4

如何

SELECT * 
FROM students 
WHERE address NOT IN ('address','address, here')