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dynamic query in drupal 8

QUERY:1 
$query = db_select('custom_live_blog','lb');
    $query->fields('lb');
    $query->condition('lb.blog_nid',$blog_nid);
    $query->condition('lb.user_id',$user_id);
    $result = $query->execute()->fetchAll();
    return $result;

Result

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