從某些類別中選擇

Question

我有5個類別的數據庫，我試圖顯示其中4個。基本上我不想顯示錶中有category=1的行。這是我嘗試

SELECT * FROM posts WHERE category IN (2, 7, 8, 9) ORDER BY RAND() 

，但仍顯示行（項目），這是從類別1.

Answer 1

我相信問題在別的地方。爲確保它不提取類別爲1的記錄，可以在where子句中添加一個條件。

SELECT * 
FROM posts 
WHERE category <> 1 
    AND category IN (2, 7, 8, 9) 
ORDER BY RAND() 

Answer 2

SELECT * FROM posts WHERE category IN (2, 7, 8, 9) ORDER BY RAND() 

嘗試添加類！= 1到你的查詢

SELECT * FROM posts WHERE category != 1 and category IN (2, 7, 8, 9) ORDER BY RAND() 

您可以從排除類別1的帖子中選擇所有類別

SELECT * FROM posts WHERE category != 1 

Answer 3

下面指定將返回所有類別，除了 類別查詢1

SELECT * FROM posts WHERE category NOT IN (1)