Question

Hi i have the following query/table from a local bookstore

$queryadmin ="SELECT last_name, first_name, user_id FROM users";
$recordz = @mysqli_query ($dbc, $queryadmin);

while ($row = mysqli_fetch_array($recordz, MYSQLI_ASSOC)) {
echo '<tr>
<td align="left">' . $row['first_name'] . '</td>
<td align="left">' . $row['last_name'] . '</td>
<td align="left">' . $row['user_id'] . '</td>
</tr>'
;} 

now i want an additional column from another table where the numbers of books each user has lend out are displayed.
So the query if nested seperately would go something like this

$query2 = mysql_query("SELECT FROM mirror3 WHERE userid='".$row['user_id']."'", $link); 
$anzahl = mysql_num_rows($query2);  

placing this query nested inside the while query (right after while starting) from above does not work. How to do that?

supplied argument is not a valid MySQL
result resource

thanks

Answer 1

Your query is wrong. Specify a field name:

$query2 = mysql_query(“SELECT
SOMETHING FROM mirror3 WHERE userid='”.$row[‘user_id’].”‘”, $link);