mysql - 需要解决查询问题的建议

Question

我的查询如下：

SELECT collection_content_mappings.tbl_content_common_id
FROM collection_content_mappings Inner Join tbl_content_commons ON     collection_content_mappings.tbl_content_common_id = tbl_content_commons.id 

INNER JOIN tbl_content_additionals ON collection_content_mappings.tbl_content_common_id =   tbl_content_additionals.content_content_code 

WHERE collection_content_mappings.collection_id = 1

这部分是问题：

collection_content_mappings.tbl_content_common_id = tbl_content_additionals.content_content_code

字段“collection_content_mappings.tbl_content_common_id”不是需要等同的字段；相反，我必须采取tbl_content_commons.content_common_code from tbl_content_commons where collection_content_mappings.tbl_content_common_id = tbl_content_commons.id. 如何将此添加到上面的查询中？

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Answer 1

在构建查询时，您确实应该重命名表。我不知道我是否正确理解你想要什么，但我认为是这样的：

    SELECT tbl_content_commons.id
    FROM tbl_content_commons
    Inner Join collection_content_mappings ON                         collection_content_mappings.tbl_content_common_id = tbl_content_commons.id 
    INNER JOIN tbl_content_additionals  ON tbl_content_additionals.content_content_code  = tbl_content_commons.content_common_code 
    WHERE tbl_content_commons.id = 1