Hello guys

This is my first posting to the list, even though I've had some experience 
with C++, these are my first steps with php and mysql.

Well, the thing is that I'm getting the following message:

Warning: Supplied argument is not a valid MySQL result resource 
in /var/www/bva/new/main/colecciones.php on line 35

The code is shown below:

$query_cat = "select author_names || ' ' || author_surnames 
              from author, author-cat
              where author_cat.cat_code = $code
              and author.author_code = author-cat.author_code";
$result_cat = mysql_query($query_cat);
$num_results_cat = mysql_num_rows($result_cat);  //This is line 35

I did the same with a simpler select sentence and it worked alright, so I 
guess there's a problem with the select sentence but haven't been able to 
find it.

Does anyone have an idea?

Thanks a lot for your help.

                         Wilmar Pérez
                     Network Administrator
                       Library System
                      Tel: ++57(4)2105145
                    University of Antioquia
                       Medellín - Colombia

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