sql - 使用多个表从数据库中获取正确的 ID

Question

我有这个 SQL 查询来获取特定类别中的所有博客文章：

SELECT * FROM blogposts AS bp, blogpost_categories AS bpc
WHERE bpc.id_category = '3'
AND bpc.id_blogpost = bp.id
ORDER BY bp.date_published DESC

问题是，当我获取博客文章的 ID 号时，我得到的是类别 ID 号，这是错误的。

我该如何解决这个问题？

提前致谢。

Answer 1

指定您想要的 ID（febp.id或bpc.id.）并考虑使用 ajoin来澄清查询：

SELECT  bp.id as BlogPostId
,       bpc.id as CategoryId
FROM    blogposts AS bp
JOIN    blogpost_categories AS bpc
ON      bpc.id_blogpost = bp.id
WHERE   bpc.id_category = '3'