Question

Table articles stores articles id ant title values. Table similar adds extra articles with similar_id by matching article = similar table ID.

I’d better show output, its very hard to explain in words:

Article with id 3 -> Title3 Text3
when
Similar articles -> Title1(voteup,votedown), Title2(voteup,votedown)

because article table id = similar table id. ( 3 = 3[similar_id 1],3[similar_id 2]. )
And probably when article outputs similar articles id it has to back and take title of similar_id from first table.

–

Table Articles:

    ID     Title    text

    1      title1   text1
    2      title2   text2
    3      title3   text3

Table Similar:

    ID     Similar_ID   voteup votedown

    1          2          50      2
    2          3         1621    531
    3          1         ...     ...
    3          2         ...     ...

Answer 1

Based on your requirements, the Similar_ID field is a red herring here and shouldn’t be included in the query:

SELECT articles.Title, similar.VoteUp, similar.VoteDown
FROM articles
JOIN similar ON articles.ID = similar.ID
WHERE articles.ID = 3

And to include similar titles (although I’m not quite sure how you want the data structured), you can do this:

SELECT articles.Title, similar.VoteUp, similar.VoteDown, similar_articles.Title AS SimilarTitle
FROM articles
JOIN similar ON articles.ID = similar.ID
JOIN articles similar_articles ON similar.Similar_ID = similar_articles.ID
WHERE articles.ID = 3