protected function skipRowsClause() {
        $skipClause = [];
        foreach ($this->skipRows as $cl => $val) {
            $skipClause[] = ['<>', $cl, $val];
        }
        if (count($skipClause) > 1) array_unshift($skipClause, 'and');

       return $skipClause;
    }
protected function skipRowsClause() {
        $skipClause = [];
        foreach ($this->skipRows as $cl => $val) {
            $skipClause[] = ['<>', $cl, $val];
        }
        if (count($skipClause) > 1) array_unshift($skipClause, 'and');

       return $skipClause;
    }
Returns a clause to be used in queries to omit rows which supposed to be skipped in accordance to config.

@return array