3 tables, 1 query

[jabbamonkey]

I have three tables I\'m trying to combine. Two tables have information regarding a subject, and the third table is what I call the \"Connection\" table. I have the following query....

SELECT 

 a.comment_id, 

 a.name, 

 a.email, 

 a.comment, 

 a.live, 

 b.article_name,

 b.article_id,

 c.article_id, 

 c.comment_id, 

 c.commentjuke_id 

FROM 

 comments as a, 

 articles as b, 

 connect_commentarticles as c 

WHERE 

 c.article_id=\'$id\' 

 AND 

 a.comment_id=c.comment_id 

 AND 

 a.live=\'1\'";

Basically, Comments for articles are stored in one table. Articles content is stored in the other, and the third table pulls the two tables together (only three columns, for the article id, the comments id, and it\'s own id). I just want to pull the tables together but keep getting an error.

 

NOTE: the variable \"$id\" is the article id, that will be submitted by the user.

 

Please let me know if you can help!

[michael yare]

You have only joined a to c.

 

You need to join b to a or c.

[jabbamonkey]

Would this be right?

 

SELECT 

 a.comment_id, 

 a.name, 

 a.email, 

 a.comment, 

 a.live, 

 b.article_name, 

 b.article_id, 

 c.article_id, 

 c.comment_id, 

 c.commentjuke_id 

FROM 

 comments as a, 

 articles as b, 

 connect_commentarticles as c 

WHERE 

 b.article_id=\'$id\' 

 AND 

 c.article_id=b.article_id

 AND 

 a.comment_id=c.comment_id 

 AND 

 a.live=\'1\'";

[michael yare]

Looks good. You only need 1 articleID in the SELECT clause BTW (not that it matters, but its efficient syntax).

[jabbamonkey]

I keep getting an error ...

 

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in...

 

Does it matter the order of the WHERE clause? For example, does it matter if \"b.article_id=c.article_id\" or \"c.article_id=b.article_id\"?

 

 

SELECT 

 a.comment_id, 

 a.name, 

 a.email, 

 a.comment, 

 a.live, 

 b.article_name, 

 c.article_id, 

 c.comment_id, 

 c.commentjuke_id 

FROM 

 comments as a, 

 articles as b, 

 connect_commentarticles as c 

WHERE 

 b.article_id=\'$id\' 

 AND 

 c.article_id=b.article_id 

 AND 

 a.comment_id=c.comment_id 

 AND 

 a.live=\'1\'";

[michael yare]

No, the order of the WHERE clauses does not matter.

 

What are you passing to mysql_num_rows?

 

I just tested your syntax with one of my a-b-c tables and it worked.

[jabbamonkey]

After I set my query; here\'s what I have....

 

$result2 = mysql_query($query1,$db);

$num_results = mysql_num_rows($result2);

if($num_results!=0)

{

    do {



         // PRINT INFORMATION FROM DATABASE



         } while ($myrow2 = mysql_fetch_array($result2));

}

[Barand]

Best way is to

 

echo \"$query1\"

 

to see what is actually being executed. Could be that $id is empty.