mysql - ON 子句中另一个未知列名错误

Question

查询:

SELECT  c.title AS title
            , c.introtext AS body
            , c.state AS state
            , c.created AS created
            , c.created_by AS uid
            , c.modified AS modified
            , c.modified_by AS modified_uid
            , c.published AS published
            , c.published_by AS published_uid
            , jos_categories.title AS category
FROM
          jos_content AS c, jos_categories
INNER JOIN jos_categories AS jc
ON c.sectionid = jc.section
WHERE c.sectionid = 7

我确信sectionid列存在，但我收到错误:

Error Code: 1054. Unknown column 'c.sectionid' in 'on clause' 0.000 sec

我看到这个主题:MySQL unknown column in ON clause但我也解决不了。

Answer 1

将 FROM 子句更改为:

FROM   jos_content AS c
INNER JOIN jos_categories AS jc 
ON c.sectionid = jc.section 
WHERE c.sectionid = 7