Запрос ко второй таблице

$sql = 'SELECT * FROM cms_test WHERE cat_id = (SELECT id FROM cms_test_category WHERE id = seolink)";

SELECT t.id, t.cat_id
            FROM cms_test t
            INNER JOIN cms_test_category c ON t.cat_id = c.id
            WHERE t.id = {$seolink}

 $vid = $model->get_table_cat('cms_video','cat_id = (SELECT id FROM cms_video_category WHERE seolink = "'.$link.'")','*');

 
$vid = $model->get_table_cat('cms_video', "cat_id = (SELECT id FROM cms_video_category WHERE seolink = '{$link}' LIMIT 1)", '*');