在sql中不等于条件

Question

假设我有一张名为students的表。

列是：

student_id
first_name
last_name
address

在输出中，我想排除地址为“地址”或“地址，此处”的学生。

我试过

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

它不起作用。

它只适用于

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

怎么做？

Answer 1

怎么样

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

Answer 2

使用AND而不是OR

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

address <> 'address' OR address <> 'address, here'将始终为真，因为一个地址不能同时为'address'和'address, here'。

Answer 3

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

Answer 4

试试这个：

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