public function performQueryAnalysis($query) {
        if (preg_match('/^\\s*SELECT\\s*`?[a-zA-Z0-9]*`?\\.?\\*/i', $query)) {
            $this->hints[] = 'Use <code>SELECT *</code> only if you need all columns from table';
        }
        if (preg_match('/ORDER BY RAND()/i', $query)) {