在同一个表中选择具有相同ID但不同类别的表

Question

我尝试阅读但仍然无法弄清楚如何处理此请求：

我有这样一张桌子：

id_news  id_category   id_opinion   
113      5             152 
112      5             152 
152      8             0 
153      8             0 
114      5             153
115      5             153

我想把我的帖子称为id_category 5＆8和id_news，就像id_opinion一样我正在做这个陈述，但我不认为这是正确的

select * from news where id_category = '5' AND id_category='8' AND id_news = id_opinion

谢谢

Answer 1

你需要使用OR作为id_category，例如：

SELECT * 
FROM news 
WHERE (id_category = '5' OR id_category='8') AND id_news = id_opinion;

另一种选择是使用IN，例如：

SELECT * 
FROM news 
WHERE id_category IN ('5', '8') AND id_news = id_opinion;

Answer 2

您可以使用IN运算符来过滤id_category 5和8：

SELECT * 
FROM news 
WHERE id_category IN ('5', '8') AND id_news = id_opinion;

Answer 3

这可能有效。

SELECT c.`id_news` as `newsId`,c.id_category as `Category`,c.id_opinion as `opinion`,d.`id_news` as `newsId1`,d.id_category as `Category1`,d.id_opinion as `opinion1` 
from news as c 
JOIN news as d on c.`id_news` = d.`id_opinion`
where c.id_category in(5,8)