Mysql详细信息:
- 表 A(名称:帖子):id
- 表 B(名称:post_has_relate):post_id、object_id
我可以在表 A 中获取具有与 post_id 为 const 相同的 object_id 的帖子吗?我尝试用子查询来写。我可以用 join
来编写它吗?
SELECT
p.sumary AS sumary,
p.source_link AS source_link,
p.source_name AS source_name,
p.created AS created,
p.id AS id,
p.slug AS slug
FROM
post_has_relate AS pr
LEFT JOIN post as p ON p.id = pr.post_id
WHERE
pr.object_id IN (
SELECT
post_has_relate.object_id AS object_id
FROM
post_has_relate
WHERE
post_has_relate.post_id = 1052
)
AND pr.post_id != 1052
AND p. STATUS = 1
GROUP BY
p.id
ORDER BY
p.created DESC
LIMIT 5 OFFSET 0
最佳答案
我认为您可以通过连接获得相同的结果:
SELECT
p.sumary AS sumary,
p.source_link AS source_link,
p.source_name AS source_name,
p.created AS created,
p.id AS id,
p.slug AS slug
FROM
post_has_relate AS pr
LEFT JOIN post as p ON p.id = pr.post_id
JOIN post_has_relate AS pr2
ON pr2.object_id=pr.object_id AND pr2.post_id=1052
WHERE
pr.post_id != 1052
AND p.STATUS = 1
GROUP BY
p.id
ORDER BY
p.created DESC
LIMIT 5 OFFSET 0
关于php - 按 id 选择第三个表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31984067/