Query always returns NULL - php

Question

So the problem is the $check variable is always NULL, even though there is already a record in the database that match the SELECT statement I have written, it's still null. I know it's simple enough but i can't find the error. I already tried using empty, isNull, ====, but the problem is the $check is always null. Why it is always null?.
$sql = "SELECT * FROM linkedin_lookup WHERE "
."`given-name`='{$table['given_name']}' && "
."`family-name`='{$table['family_name']}' && "
."`location`='{$table['location']}' && "
."`industry`='{$table['industry']}' && "
."`headline`='{$table['headline']}'";
$results = $db->query($sql);
$check = $results->num_rows;
if ($check):
echo "Record already exist";
else:
$sql = "INSERT INTO linkedin_lookup (`given-name`,`family-name`,`location`,`industry`,`headline`,`date_search`) "
."VALUES "
."('{$table['given_name']}',"
."'{$table['family_name']}',"
."'{$table['location']}',"
."'{$table['industry']}',"
."'{$table['headline']}',"
."'{$now}')";
$db->query($sql);
echo "Succesfully inserted record(s)" . '<br />';
endif;
UPDATE MY CODE TO REFLECT INPUTS, but still it accepts duplicate. Is my SELECT STATEMENT wrong?. I put && right so it;s supposed to scan all fields if the same.

Answer 1

That's because you call num_rows on the result of the query (same for fetch_assoc), NOT the array.
$results = $db->query($sql);
$check = $results->num_rows;
if( $check) {
echo "Record already exists";
}
else {
$sql = "INSERT.....";
}
Note that you could just try to insert it up front and check affected_rows - if it's zero then it faied to insert due to already existing. Note that you'll need a UNIQUE KEY on the table in the right fields.

Answer 2

If $results does infact contain something....and the query is infact working, which I dunno if it is....
You could just try this instead....
$db->query($sql);
$results = $db->fetch_assoc();
if (count($results) > 0):
//echo "Record already exist";
else:

Answer 3

Ok now it works, i think the class $db is not mysqli, because we are using a framework that is developed by the company. So my codes now as follows and It works.
$sql = "SELECT * FROM linkedin_lookup WHERE "
."`given-name`='{$table['given_name']}' && "
."`family-name`='{$table['family_name']}' && "
."`location`='{$table['location']}' && "
."`industry`='{$table['industry']}' && "
."`headline`='{$table['headline']}'";
$db->query($sql);
$check = $db->fetch_array();
if ($check):
echo "Record already exist";
else:
$sql = "INSERT INTO linkedin_lookup (`given-name`,`family-name`,`location`,`industry`,`headline`,`date_search`) "
."VALUES "
."('{$table['given_name']}',"
."'{$table['family_name']}',"
."'{$table['location']}',"
."'{$table['industry']}',"
."'{$table['headline']}',"
."'{$now}')";
$db->query($sql);
echo "Succesfully inserted record(s)" . '<br />';
endif;