mysql – 如何在单个列上执行AND操作？

我有一个有两列的桌子;

CREATE TABLE IF NOT EXISTS `QUESTION_CATEGORY_RELATION` (
  `question_id` int(16) NOT NULL,
  `category_id` int(16) NOT NULL,
  KEY `category_id` (`category_id`),
  KEY `question_id` (`question_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `QUESTION_CATEGORY_RELATION` (`question_id`, `category_id`) VALUES
(1, 2),
(1, 3),
(2, 1),
(2, 2);

我想创建一个查询,搜索带有content_id 2和content_id 3的question_id

例如.：

SELECT *  
FROM `QUESTION_CONTENTS_REL` 
WHERE `content_id` = 2 AND `content_id` = 3

解决方法:

SELECT question_id
FROM QUESTION_CONTENTS_REL
WHERE content_id in (2, 3)
group by question_id
having count(distinct content_id) = 2

标签：sql,mysql,database,mysqli,boolean-logic
来源： https://codeday.me/bug/20190901/1784764.html