为什么此 SQL 代码会给出错误 1066(非唯一表/别名:'user')?
这是我的表结构:
错误信息是:
#1066 - 不是唯一的表/别名:'user'
#1066 - Not unique table/alias: 'user'
以下是我的代码.
SELECT article.* , section.title, category.title, user.name, user.name
FROM article
INNER JOIN section ON article.section_id = section.id
INNER JOIN category ON article.category_id = category.id
INNER JOIN user ON article.author_id = user.id
LEFT JOIN user ON article.modified_by = user.id
WHERE article.id = '1'
推荐答案
第二次加入时需要给用户表一个别名
You need to give the user table an alias the second time you join to it
例如
SELECT article . * , section.title, category.title, user.name, u2.name
FROM article
INNER JOIN section ON article.section_id = section.id
INNER JOIN category ON article.category_id = category.id
INNER JOIN user ON article.author_id = user.id
LEFT JOIN user u2 ON article.modified_by = u2.id
WHERE article.id = '1'
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