不等於sql條件

Question

比方說，我有一個名爲students的表。

欄目有：

student_id 
first_name 
last_name 
address 

在輸出中，我要排除具有「地址」或「地址，在這裏」的地址學生。

我試圖

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

這是行不通的。

它只與

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

工作如何做到這一點？

Answer 1

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

Answer 2

試試這個：

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'將永遠是正確的，因爲一個地址不能'address'和'address, here'在同一時間。

Answer 4

如何

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